Random access method, network node and user equipment

ABSTRACT

The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a random access method, a network node and a user equipment. With the solution of the above embodiment of the present disclosure, the performance of the UE randomly accessing the target cell can be improved.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of application Ser. No. 17/372,152,filed Jul. 9, 2021, which is a continuation of application Ser. No.16/500,079, now U.S. Pat. No. 11,064,401, which is the 371 NationalStage of International Application No. PCT/KR2018/003870, filed Apr. 2,2018, which claims priority to Chinese Patent Application No.201710214206.8, filed Apr. 1, 2017, Chinese Patent Application No.201710313539.6, filed May 5, 2017, Chinese Patent Application No.201710491173.1, filed Jun. 23, 2017, Chinese Patent Application No.201710855759.1, filed Sep. 20, 2017, Chinese Patent Application No.201710928123.5, filed Sep. 30, 2017, Chinese Patent Application No.201711227251.3, filed Nov. 29, 2017, the disclosures of which are hereinincorporated by reference in their entirety.

BACKGROUND 1. Field

The present disclosure relates to the field of wireless communicationtechnology, and more particularly, to a random access method, a networknode and a user equipment.

2. Description of Related Art

To meet the demand for wireless data traffic having increased sincedeployment of 4G communication systems, efforts have been made todevelop an improved 5G or pre-5G communication system. Therefore, the 5Gor pre-5G communication system is also called a ‘Beyond 4G Network’ or a‘Post LTE System’. The 5G communication system is considered to beimplemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, soas to accomplish higher data rates. To decrease propagation loss of theradio waves and increase the transmission distance, the beamforming,massive multiple-input multiple-output (MIMO), Full Dimensional MIMO(FD-MIMO), array antenna, an analog beam forming, large scale antennatechniques are discussed in 5G communication systems. In addition, in 5Gcommunication systems, development for system network improvement isunder way based on advanced small cells, cloud Radio Access Networks(RANs), ultra-dense networks, device-to-device (D2D) communication,wireless backhaul, moving network, cooperative communication,Coordinated Multi-Points (CoMP), reception-end interference cancellationand the like. In the 5G system, Hybrid FSK and QAM Modulation (FQAM) andsliding window superposition coding (SW SC) as an advanced codingmodulation (ACM), and filter bank multi carrier (FBMC), non-orthogonalmultiple access (NOMA), and sparse code multiple access (SCMA) as anadvanced access technology have been developed.

The Internet, which is a human centered connectivity network wherehumans generate and consume information, is now evolving to the Internetof Things (IoT) where distributed entities, such as things, exchange andprocess information without human intervention. The Internet ofEverything (IoE), which is a combination of the IoT technology and theBig Data processing technology through connection with a cloud server,has emerged. As technology elements, such as “‘sensing technology’”,“‘wired/wireless communication and network infrastructure’”, “‘serviceinterface technology’”, and “‘Security technology’” have been demandedfor IoT implementation, a sensor network, a Machine-to-Machine (M2M)communication, Machine Type Communication (MTC), and so forth have beenrecently researched. Such an IoT environment may provide intelligentInternet technology services that create a new value to human life bycollecting and analyzing data generated among connected things. IoT maybe applied to a variety of fields including smart home, smart building,smart city, smart car or connected cars, smart grid, health care, smartappliances and advanced medical services through convergence andcombination between existing Information Technology (IT) and variousindustrial applications.

In line with this, various attempts have been made to apply 5Gcommunication systems to IoT networks. For example, technologies such asa sensor network, Machine Type Communication (MTC), andMachine-to-Machine (M2M) communication may be implemented bybeamforming, MIMO, and array antennas. Application of a cloud RadioAccess Network (RAN) as the above-described Big Data processingtechnology may also be considered to be as an example of convergencebetween the 5G technology and the IoT technology.

Rapid developments of information industry, especially growing demandsfrom a mobile internet and an internet of things (IoT), bringunprecedented challenges to future mobile communication technologies.According to a report ITU-R M. [IMT.BEYOND 2020.TRAFFIC] of theInternational Telecommunication Union (ITU), it can be expected that thegrowth of mobile traffic will increase nearly 1000 times that of 2010(4G era) by 2020, a number of user equipment connections will be morethan 17 billion, and with gradually penetrating of massive IoT devicesto the mobile communication network, the number of connected deviceswill be even more astonishing. To meet this unprecedented challenge, thecommunication industry and academia have embarked on a wide-rangingfifth generation (5G) mobile communication technology research for the2020s. Currently, a framework and an overall goal of the future 5G arediscussed in the ITU report ITU-R M. [IMT.VISION], wherein demandoutlooks, application scenarios and various key performance indicatorsfor 5G are described in detail. For new requirements in 5G, the ITUreport ITU-R M. [IMT.FUTURE TECHNOLOGY TRENDS] provides information ontechnology trends for 5G, aiming to address significant issues such as asignificant increase in system throughput, user experience consistency,scalability to support IoT, time delay, energy efficiency, cost, networkflexibility, emerging business support, and flexible spectrumutilization.

Performance of a random access directly affects the user's experience.In traditional wireless communication systems, such as LTE andLTE-Advanced, the random access procedure is applied to multiplescenarios such as establishing an initial link, cell handover,reestablishing an uplink, and Radio Resource Control (RRC) connectionreestablishment, and is divided into a Contention-based Random Accessand a Contention-Free Random Access according to whether the user hasexclusive preamble sequence resources. In the contention-based randomaccess, when the user attempts to establish an uplink, selecting apreamble sequence from the same preamble sequence resource may result inthat multiple users select the same preamble sequence and transmit it tothe base station. Therefore, a contention resolution mechanism is animportant research direction in the random access. How to reduce aprobability of the contentions and how to quickly resolve an occurredcontention are key indicators that affect the random access performance.

The contention-based random access procedure in the LTE-A is dividedinto four steps, as shown in FIG. 1 . FIG. 1 is a schematic diagramillustrating a conventional contention-based random access procedure. Inthe first step, a user randomly selects a preamble sequence from apreamble sequence resource pool and transmits it to the base station.The base station detects a correlation of the received signal toidentify the preamble sequence sent by the user. In the second step, thebase station transmits a Random Access Response (RAR) to the user,comprising a random access preamble sequence identifier, a timingadvance instruction determined based on an estimation of a time delaybetween the user and the base station, a temporary Cell-Radio NetworkTemporary Identifier (C-RNTI), and a time-frequency resource allocatedfor the user's next uplink transmission. In the third step, the usertransmits a Third Message (Message 3, Msg3) to the base stationaccording to the information in the RAR. The Msg3 includes informationsuch as a User Equipment (UE) identifier and a RRC link request, whereinthe UE identifier is unique to the user and is used to resolve thecontention. In the fourth step, the base station transmits the user acontention resolution identifier, which includes the UE identifier ofthe user who has won the contention resolution. After detecting its ownidentifier, the user upgrades the temporary C-RNTI to a C-RNTI andtransmits an ACK signal to the base station to complete the randomaccess procedure and waits for a scheduling from the base station.Otherwise, the user will start a new random access procedure after atime delay.

For the contention-free random access procedure, the user may beassigned a preamble sequence because the base station already knows theuser identifier. Therefore, when transmitting the preamble sequence, theuser does not need to randomly select the preamble sequence, but usesthe assigned preamble sequence. After detecting the assigned preamblesequence, the base station transmits a corresponding random accessresponse including information such as timing advance and uplinkresource allocation, etc. After receiving the random access response,the user considers that an uplink synchronization has been completed andwaits for a further scheduling from the base station. Therefore, thecontention-free random access procedure includes only two steps: Step 1is to transmit the preamble sequence; and Step 2 is to transmit therandom access response.

The random access procedure in LTE is suitable for the followingscenarios:

-   -   1. Initial accessing under RRC_IDLE;    -   2. Re-establishing RRC connection;    -   3. Cell handover;    -   4. In RRC connected state, downlink data arrives and random        access procedure is requested (when the uplink is in        asynchronous);    -   5. In the RRC connected state, the uplink data arrives and        random access procedure is requested (when the uplink is in        asynchronous or there is no resource allocated for the        scheduling request in the PUCCH resource);    -   6. Positioning.

In the LTE, the above six scenarios use same random access steps. In astandard study of 5G, millimeter-wave communication is a possible keytechnology for 5G. By increasing a carrier frequency to themillimeter-wave band, an available bandwidth will increase greatly, thusgreatly increasing the system's transmission rate. In order to combatcharacteristics of high fading and high loss in the wireless channel ofthe millimeter-wave band, the millimeter-wave communication systemgenerally adopts a beamforming technology, that is, beam energies areconcentrated in a certain direction by using a weighting factor. Whenperforming the wireless communication, the base station and the usersearch an optimal beam pair by polling or the like so as to maximize areception signal-noise ratio (SNR) at the user side.

In the millimeter-wave system, for the base station, it is required toconfigure a UE-specific sounding reference signal (SRS) or a channelstate information reference signal (CSI-RS) for a UE, which is criticalfor a beam management and a beam correction for uplink between the basestation and the UE. Therefore, the UE needs to report a number of beamsowned by itself to the base station, and the number of beams can beconsidered as a capability possessed by the UE. If the base station canknow the number of beams possessed by the UE in time when the UEaccesses or after the UE accesses, the base station can allocateappropriate time-frequency resources to the UE and configure appropriateSRSs and CSI-RSs in processes of the resource allocation, the beammanagement, the beam correction, and the cell handover, in order toavoid a waste of system resources and improve a resource utilizationefficiency.

In existing discussions of the 5G standard, the communication systemuses the beamforming method, but there is no suitable signaling and flowfor the UE to notify the base station of the beam-numbers capability ofitself, which leads to a low resource utilization efficiency of theexisting millimeter wave system, and thus it is unable to reasonablyconfigure allocation resources, for example, resources for SRSs andCSI-RSs, according to the number of beams of the UE.

With regard to the contention-free random access procedure, since thebase station has obtained the user ID, the base station may allocate apreamble sequence for the user. Therefore, when the user sends thepreamble sequence, the user may not need to randomly select a sequence,but use the allocated preamble sequence. After detecting the allocatedpreamble sequence, the base station may send a corresponding randomaccess response including information such as timing advance and ULresource allocation. When the user receives the random access response,the user may have finished the UL synchronization and waited for furtherscheduling of the base station. Therefore, the contention-free randomaccess procedure may include two steps: step one is transmitting thepreamble sequence and the step two is transmitting the random accessresponse.

SUMMARY

In the LTE, the above-described six scenarios may use same random accesssteps. In some scenarios, such as no resource is allocated to ascheduling request in the PUCCH resources, the contention-based randomaccess procedure actually works at an RRC connection state. Therefore,the existing random access procedure may be optimized, so that theoptimized random access procedure may be more applicable to the schedulerequest scenario in the connection state. Further, in the Radio Access(NR), there may be some other application scenarios, that may need thecontention-based random access in the RRC connection state. The someother application scenarios may include a beam request or a beamrecovery procedure when the carrier frequency is larger than 6 GHz.Therefore, in the NR standardization, it is necessary to provide anoptimized UL schedule request mode for the user in the connection state.

In the traditional LTE network, when the network transmits theinformation of the second step in the random access, i.e. when thenetwork transmits the random access response, a Random Access-RadioNetwork Temporary Identifier (RA-RNTI) is needed to scramble the RARinformation. Meanwhile, the user side may use the same mode to generatethe RA-RNTI to descramble the RAR and detect the random access response.At present, the RA-RNTI is calculated using random access time-frequencyresource locations bearing the random access preamble. Therefore, theusers, which transmit the preamble on the same random accesstime-frequency resource, may generate the same RA-RNTI.

In the standard research of 5G, a downlink transmission beam is bound toavailable random access resources (random access channel resourcesand/or random access preamble code resources), so that the base station(BS) can acquire the available downlink transmission beams selected bythe UE through the detected preamble codes from the user equipment (UE)and/or the time-frequency resources where the detected preamble codesare located. However, in general, the downlink transmission beam used bySynchronization signal block (SS-block) is a wide beam. When the UEaccesses the system after passing through the random access process, itis necessary to continue beam management or beam correction operation toobtain a better (narrower) beam, so as to obtain higher beamforminggain; in another case, the BS detects that there is a better beamavailable to the UE in the connected state due to a change in movementor environment. Therefore, the UE is notified of changing a new beam. Atthis time, the timing advance (TA) value of the UE is possible to changedue to the change or adjustment of the beam. Therefore, the UE needs tobe notified of a new TA or TA adjustment.

In addition, when the UE needs to adjust or change the used transmissionbeam, the timing information will be changed. The BS needs to measureand calculate the new timing information and notify the UE. Since thechange of the timing information is related to the beam adjustmentchange, how to notify the UE of the new timing information becomes a keyproblem to be solved.

Compared with the existing LTE systems, 5G will introduce systems whichoperate in high bands, in order to improve the data transmissionefficiency and spectrum efficiency of the systems. The introduction ofhigh bands significantly increases the available bandwidth for wirelesscommunication, so that the systems can support a larger subcarrierinterval. The increase in the subcarrier interval shortens thetime-domain symbols, so the supportable cell radius becomes smaller.

Timing Advance (TA) is used for instructing a terminal to transmit inadvance uplink data before a downlink reference timing sequence, to makeup different transmission delays for different terminals due todifferent transmission paths, so that uplink data transmitted bydifferent terminals can arrive at a base station at the same time forthe purpose of uplink synchronization. The effect of the TA is describedsimply in FIG. 42 . In FIG. 42 , the first transmitted data representsdata transmission performed by a terminal on the basis of downlinksynchronization. However, due to factors such as delay, the uplink datareceived by a base station may be shown in the second picture. That is,the received data is delayed with respect to the downlink referencetiming sequence. This delay will lead to a Cyclic Prefix (CP) in an OFDMdetection window, and consequently, the detection is disturbed. To avoidthis problem, the base station configures a TA for the terminal, and theterminal transmits, according to the TA, data in advance on the basis ofthe downlink synchronization reference timing sequence. This process isshown in the third picture in FIG. 42 . With the use of the TA, it isable to ensure that data can fall into the OFDM detection window even ifit is delayed, as shown in the fourth picture in FIG. 42 . The size ofthe TA is mainly determined by the supportable cell radius. In LTE, aninitial TA is configured in a random access response during a randomaccess process, and this configuration information is in uniform form of11-bit configuration information. This configuration will not changewith the change in the supported cell radius or subcarrier interval. Theterminal adjusts the timing sequence of Msg3 according to the TA, andtransmits the Msg3. Meanwhile, during the data transmission, it is alsonecessary to adjust the TA according to the change of channel state.This TA adjustment amount is 6-bit information.

In 5G, due to the high bands and the change in the subcarrier interval,the supported cell radius changes to kilometers from tens of meters andthus the effective range of the TA also significantly changes. Moreover,due to the shortened symbol length caused by the increase in thesubcarrier interval, the dynamic range of the TA is reduced. The use ofTA configuration information of the same bit number and the sameresolution will cause the waste of bits for TA configuration, and as aresult, the running efficiency of the system is decreased. Therefore, inview of this problem, it is necessary to design a corresponding TAconfiguration method by which TA configuration for systems withdifferent subcarrier interval can be completed in the premise of savingthe signaling overhead.

The present disclosure provides a random access method, a network nodeand a user equipment (UE).

According to an aspect of the present disclosure, there is provided arandom access method comprising the steps of: measuring, by a userequipment UE, a signal of a target cell; sending, by the UE, ameasurement report on the signal of the target cell to a network nodecorresponding to a serving cell; receiving, by the UE, a handovercommand including resource configuration information for random accessfrom the network node; and performing, by the UE, random access to thetarget cell based on the resource configuration information.

In an exemplary embodiment, the resource configuration informationincludes at least one of: random access resource configurationinformation based on a normal uplink; and random access resourceconfiguration information based on a supplementary uplink.

In an example embodiment, the resource configuration information furtherincludes an indication indicating to the UE whether to use the normaluplink or the supplementary uplink for the random access.

In an exemplary embodiment, the resource configuration informationfurther includes dedicated random access resource configurationinformation sent to the UE.

In an exemplary embodiment, the dedicated random access resourceconfiguration information includes a first threshold for the UE todetermine whether to use the normal uplink or the supplementary uplinkfor the random access.

In an exemplary embodiment, the UE obtains the measurement report bymeasuring a synchronization signal block SSB or a configured channelstatus information-reference signal CSI-RS of the target cell, and theresource configuration information further includes: a mappingrelationship between the SSB and a corresponding random access resourceor a mapping relationship between the CSI-RS and a corresponding randomaccess resource; and a second threshold for selecting the SSB or theCSI-RS.

In an exemplary embodiment, the UE obtains the measurement report bymeasuring a synchronization signal block SSB or a configured channelstatus information-reference signal CSI-RS of the target cell, and thededicated random access resource configuration information includes: amapping relationship between the SSB and a corresponding random accessresource or a mapping relationship between the CSI-RS and acorresponding random access resource; and a second threshold forselecting the SSB or the CSI-RS.

In an exemplary embodiment, the method further includes the steps of:comparing, by the UE, a latest signal measurement result of the targetcell with the first threshold; and determining whether to use the normaluplink or the supplementary uplink for the random access according tothe comparison result.

According to another aspect of the present disclosure, there is provideda random access method comprising the steps of: receiving, from a userequipment UE, a measurement report on a signal of a target cell; andsending, to the UE, a handover command including resource configurationinformation for random access, based on the measurement report.

In an exemplary embodiment, the resource configuration informationincludes at least one of: random access resource configurationinformation based on a normal uplink; and random access resourceconfiguration information based on a supplementary uplink.

In an example embodiment, the resource configuration information furtherincludes an indication indicating to the UE whether to use the normaluplink or the supplementary uplink for random access.

In an exemplary embodiment, the resource configuration informationfurther includes dedicated random access resource configurationinformation sent to the UE.

In an exemplary embodiment, the dedicated random access resourceconfiguration information includes a first threshold for the UE todetermine whether to use a normal uplink or a supplementary uplink forthe random access.

In an exemplary embodiment, the measurement report is obtained by the UEby measuring a synchronization signal block SSB or a configured channelstatus information-reference signal CSI-RS of the target cell, and theresource configuration information further includes: a mappingrelationship between the SSB and a corresponding random access resourceor a mapping relationship between the CSI-RS and a corresponding randomaccess resource; and a second threshold for selecting the SSB or theCSI-RS.

In an exemplary embodiment, the measurement report is obtained by the UEby measuring a synchronization signal block SSB or a configured channelstatus information-reference signal CSI-RS of the target cell, and thededicated random access resource configuration information includes: amapping relationship between the SSB and a corresponding random accessresource or a mapping relationship between the CSI-RS and acorresponding random access resource; and a second threshold forselecting the SSB or the CSI-RS.

According to another aspect of the present disclosure, there is provideda user equipment, comprising: a communication interface configured tocommunicate; a processor; and a memory storing computer-executableinstructions that, when executed by the processor, cause the processorto perform the following operations: measuring a signal of a targetcell; sending a measurement report on the signal of the target cell to anetwork node corresponding to a serving cell; receiving, from thenetwork node, a handover command including resource configurationinformation for random access; and performing random access to thetarget cell based on the resource configuration information.

According to another aspect of the present disclosure, there is provideda network node, comprising: a communication interface configured tocommunicate; a processor; and a memory storing computer-executableinstructions that, when executed by the processor, cause the processorto perform the following operations: receiving, from a user equipmentUE, a measurement report on a signal of a target cell; and sending, tothe UE, a handover command including resource configuration informationfor random access, based on the measurement report.

Through the solutions of the above embodiments of the presentdisclosure, the performance of the UE randomly accessing the target cellcan be improved.

Embodiments of the present disclosure provide information generationmethods, which may distinguish users who have selected different DLtransmission beams and may improve detection efficiency of the RAR.

In order to achieve the above objective, embodiments of the presentdisclosure may adopt following technical schemes:

An information generation method, includes:

-   -   sending, by a User Equipment (UE), a random access preamble to a        base station;    -   calculating, by the UE, a Random Access-Radio Network Temporary        Identifier (RA-RNTI) according to an index of a preamble group,        to which the transmitted random access preamble belongs, and a        resource location of a random access resource bearing the random        access preamble;    -   wherein the preamble group is a group of available random access        preambles corresponding to the random access resource.

Preferably, the random access resource is determined according to aDownlink (DL) transmission beam, which is selected by the UE accordingto DL measurement;

-   -   the transmitted random access preamble is selected from a        preamble group, which corresponds to the random access resource        and is bound with the DL transmission beam selected by the UE        based on the DL measurement.

Preferably, the random access resource is determined according to aphysical broadcast signal or a synchronization signal block, which isselected by the UE according to DL measurement;

-   -   the transmitted random access preamble is selected from a        preamble group, which corresponds to the random access resource        and is bound with physical broadcast signal or synchronization        signal block selected by the UE based on the DL measurement.

Preferably, when there is an one-to-one binding relationship betweeneach different preamble group and each different DL transmission beam,the index of the preamble group is an index of the selected DLtransmission beam.

Preferably, the preamble group is determined according to a preambleroot sequence group, to which a preamble root sequence used by therandom access preamble belongs, and random access preambles determinedusing preamble root sequences of a same group belong to a same preamblegroup;

-   -   the index of the preamble is an index of a root sequence group,        at which the preamble root sequence of the random access        preamble is located.

Preferably, the preamble group is determined according to an OrthogonalCover Code (OCC) group, to which an OCC used by the available randomaccess preamble belongs, and random access preambles determined usingOCCs of a same group belong to a same preamble group;

-   -   the index of the preamble group is an index of an OCC group, at        which an OCC used to generate the random access preamble is        located.

Preferably, the preamble group is determined according to a Cyclic Shift(CS) group, to which a CS value used by the random access preamblebelongs, and random access preambles determined using CSs of a samegroup belong to a same preamble group;

-   -   the index of the preamble group is an index of a CS group, at        which a CS value used to generate the random access preamble is        located.

Preferably, the preamble group is determined according to the randomaccess preamble, and each random access preamble is a preamble group;

-   -   the index of the preamble group is a random access preamble        index.

Preferably, calculating the RA-RNTI according to the index of thepreamble group and the resource location of random access resourcebearing the random access preamble includes:

-   -   with regard to the random access resource bearing the        transmitted random access preamble, calculating the RA-RNTI        according to index information t_id of a time unit, at which a        starting location of the random access resource is located,        index information f_id of a frequency unit, at which a starting        location of the random access resource is located, and an index        pg_id of the preamble group, RA-RNTI=1+a*t_id+b*f_id+c*pg_id, a,        b, and c are weight coefficients of preset t_id, f_id and pg_id.

Preferably, when different random access resources do not havedifferences on time domain, the t_id is set as 0 when calculating theRA-RNTI; and/or

-   -   when the random access resources do not have differences on a        frequency domain, the f_id is set as 0 when calculating the        RA-RNTI.

Preferably, calculating the RA-RNTI according to the index of thepreamble group, and the resource location of random access resourcebearing the random access preamble includes:

-   -   with regard to the random access resource bearing the        transmitted random access preamble, calculating the RA-RNTI        according to an index SFN_id of a first first-time-unit, at        which the random access resource is located, index information        t_id of a first second-time-unit in the first first-time-unit,        at which the random access resource is located, index        information f_id of a first frequency domain unit, at which the        random access resource is located, and an index pg_id of the        preamble group, RA-RNTI=1+a*t_id+b*f_id+c*(SFN_id mod        (Wmax/10))+d*pg_id, a, b, c and d respectively are weight        coefficients of the t_id, f_id, (SFN_id mod (Wmax/10)) and        pg_id, Wmax is maximum window a possible random access response        window of a user.

Preferably, a=1, b=max{1+a*t_id}=M+1,c=max{1+a*t_id+b*f_id}=(max{t_id}+1)(max{f_id}+1).

Preferably, index information t_id of a time unit/a second time unitincludes: an index value of the time unit/second time unit, or the t_idis determined according to index values of multiple time units, at whichthe random access resource is located; and/or

-   -   index information f_id of a frequency unit includes: an index        value of the frequency unit, or the f_id is determined according        to index values of multiple frequency units, at which the random        access resource is located.

Preferably, an index value of the time unit/second time unit includes: asub-frame index, time slot index, small time slot index, symbol groupindex, or symbol index; and/or

-   -   the index values of the multiple time units include: multiple of        the sub-frame index, time slot index, small time slot index,        symbol group index, and symbol index; and/or    -   the first time unit is a radio frame; and/or    -   an index of the frequency unit includes: a Physical Resource        Block (PRB) group index, PRB index, subcarrier index or        subcarrier group index; and/or    -   index values of the multiple frequency units include: multiple        of the PRB group index, PRB index, subcarrier index and        subcarrier group index.

Preferably, calculating the RA-RNTI according to the index of thepreamble group, and the resource location of random access resourcebearing the random access preamble includes:

-   -   with regard to the random access resource bearing the        transmitted random access preamble, calculating the RA-RNTI        according to an index SFN_id of a first time unit, at which the        random access resource is located, and an index pg_id of the        preamble group, RA-RNTI=1+a*floor (SFN_id/4)+b*pg_id, a and b        respectively are weight coefficients of floor (SFN_id/4) and        pg_id, value of floor(x) is the maximum integer less than x.

Preferably, a=1, b=max{1+a*floor (SFN_id/4)}=floor (SFN_id/4)+1.

An information generation method, includes:

-   -   receiving, by a base station, a random access preamble from a        User Equipment (UE);    -   calculating, by the base station, a Random Access-Radio Network        Temporary Identifier (RA-RNTI) according to an index of a        preamble group, to which the received random access preamble        belongs, and a resource location of a random access resource        bearing the random access preamble;    -   wherein the preamble group is a group of available random access        preambles corresponding to the random access resource.

An information generation device, includes: a transmitting unit and acalculating unit; wherein

-   -   the transmitting unit is to send a random access preamble to a        base station;    -   the calculating unit is to calculate a Random Access-Radio        Network Temporary Identifier (RA-RNTI) according to an index of        a preamble group, to which the transmitted random access        preamble belongs, and a resource location of a random access        resource bearing the random access preamble; wherein the        preamble group is a group of available random access preambles        corresponding to the random access resource.

An information generation device, includes: a receiving unit and acalculating unit; wherein

-   -   the receiving unit is to receiving a random access preamble from        a User Equipment (UE);    -   the calculating unit is to calculate a Random Access-Radio        Network Temporary Identifier (RA-RNTI) according to an index of        a preamble group, to which the received random access preamble        belongs, and a resource location of a random access resource        bearing the random access preamble;    -   wherein the preamble group is a group of available random access        preambles corresponding to the random access resource.

It can be seen from the above technical scheme that in embodiments ofthe present disclosure, with regard to a random access resource,multiple available random access preambles may be grouped to obtainpreamble groups; the Random Access-Radio Network Temporary Identifier(RA-RNTI) may be calculated according to an index of a preamble group,to which a random access preamble transmitted by a User Equipment (UE)belongs, and a resource location of a random access resource bearing therandom access preamble. With embodiments of the present disclosure,users which have selected different DL transmission beams may bedistinguished and different users using the same random access resourcemay be distinguished, so that detection efficiency of random accessresponse may be improved.

The present disclosure provides a way of reporting information. In theexisting millimeter-wave system, there is no suitable signaling and flowfor the UE to notify the base station of the beam-numbers capability ofitself, which results in a relatively low resource utilization and anoperation efficiency for operations such as resource allocation, beammanagement and beam correction in the existing multi-beam operatingsystem. Therefore, there is a need for a new signaling and flow fornotify the beam-numbers capability of the UE, in order to improve systemwork efficiency and resource utilization.

The present disclosure provides a way of reporting information, andspecifically provides a way of indicating a capability of a UE'sbeam-numbers, and the capability of the UE's beam-numbers refers to anumber of beams that the UE has for an uplink transmission/downlinkreception. Specifically, in the random access procedure, the basestation is notified the number of beams that the UE has by thetransmission of the Message 3 or the selection of the random accessresources. When the UE completes the random access procedure, the basestation can know the number of beams that the UE has.

According to an aspect of the present disclosure, a method for randomaccess of a UE is provided, the method comprises: obtaining randomaccess configuration information; determining a preamble sequence and arandom access channel according to the random access configurationinformation, and transmitting the preamble sequence on the random accesschannel; detecting a random access response after transmitting thepreamble sequence; generating a Message 3 if the random access responseis successfully detected, wherein the Message 3 comprises an indicationof a number of beams that the UE has; and detecting contentionresolution information.

Wherein the indication of the number of beams may be N-bit indicationinformation, where N is greater than 0, and wherein the indication ofthe number of beams may be determined according to a maximum number ofbeams that the UE has or an maximum number of beams that can beprocessed by the base station.

Wherein the indication of the number of beams may be added directly intothe Message 3 or added into a radio resource control (RRC) connectionrequest in the Message 3, in a form of a new field.

The UE may detect a CSI-RS or SRS configured from the base station, andthe CSI-RS or SRS is configured by the base station for the UE accordingto the indication of the number of beams reported by the UE.

According to an aspect of the present disclosure, an apparatus forrandom access of a UE is provided, the apparatus comprises: aconfiguration information obtaining module for obtaining random accessconfiguration information; a preamble sequence transmitting module fordetermining a preamble sequence and a random access channel according tothe random access configuration information, and transmitting thepreamble sequence on the random access channel; a random access responsedetection module for detecting a random access response transmitted by abase station; a Message 3 generating and transmitting module forgenerating and transmitting a Message 3 according to the detected randomaccess response and an indication of a number of beams that the UE has,wherein the Message 3 includes the indication of the number of beamsthat the UE has; and a contention resolution receiving module fordetecting contention resolution information.

Wherein the indication of the number of beams may be N-bit indicationinformation, where N is greater than 0, and wherein the indication ofthe number of beams may be determined according to the maximum number ofbeams that the UE has or the maximum number of beams that can beprocessed by the base station.

Wherein the indication of the number of beams may be added directly intothe Message 3 or added into a radio resource control (RRC) connectionrequest in the Message 3, in a form of a new field.

The UE may detect a CSI-RS or SRS configured from the base station, andthe CSI-RS or SRS is configured by the base station for the UE accordingto the indication of the number of beams reported by the UE.

According to an aspect of the present disclosure, an apparatus forrandom access of a base station is provided, the apparatus comprises: arandom access resource configuration transmitting module fortransmitting random access resource configuration information comprisinga configured random access channel resource and a preamble sequenceresource; a preamble sequence detection module for detecting a possiblytransmitted preamble sequence on a random access channel according tothe random access configuration information; a random access responsetransmitting module for generating and transmitting a random accessresponse for the detected preamble sequence; a Message 3 detectionmodule for detecting a possible Message 3 transmission, wherein theMessage 3 includes an indication of a number of beams that the UE has;and a contention resolution transmitting module for generating andtransmitting contention resolution information if the Message 3 issuccessfully detected.

Wherein the contention solution transmitting module may furthertransmits the CSI-RSs or SRSs configured for the UE, and wherein thenumber of the CSI-RSs or SRSs configured by the base station may bedetermined according to an indication of the number of beams of the UEthat the UE reports in the Message 3.

According to an aspect of the present disclosure, a method for randomaccess of a UE is provided, the method comprises: obtaining randomaccess configuration information; selecting a corresponding randomaccess resource according to a number of beams that the UE has;generating and transmitting a preamble sequence according to a selectedrandom access resource; detecting a random access response; generatingand transmitting a Message 3 if the random access response issuccessfully detected; detecting a contention resolution message.

Wherein the random access configuration information may include randomaccess channel time-frequency resources allocated to different numbersof beams or preamble sequence resource pool information allocated todifferent numbers of beams, and wherein the selecting the random accessresource may comprises selecting the random access channeltime-frequency resource corresponding to the number of beams that the UEhas or selecting the preamble sequence resource corresponding to thenumber of beams that the UE has.

Wherein, the random access channel time-frequency resources may bedivided into non-overlapping M subsets, each subset corresponds to oneof the beam-numbers, wherein the M non-overlapping subsets correspond to0 to M−1 beams respectively. When the number of beams of the UE isbetween 0 and M−2, the time-frequency resource corresponding to thenumber of the beams is selected directly, and when the number of thebeams of the UE is M−1 or more, the time-frequency resourcecorresponding to the number of beams M−1 is selected.

The preamble sequence pool may be divided into M disjoint subsets, eachsubset corresponds to one of the beam-numbers, and the UE selects apreamble sequence from among the preamble sequence subset correspondingto its own number of beams according to the number of beams andtransmits the selected preamble sequence on the random access channel.

Wherein, the UE may transmit the preamble sequence using a plurality ofdifferent beam directions on a plurality of different random accesschannels.

According to an aspect of the present disclosure, an apparatus forrandom access of a UE is provided, the apparatus comprising: aconfiguration information obtaining module for obtaining random accessconfiguration information; a random access resource selection module forselecting a corresponding random access resource according to a numberof beams that the UE has; a preamble sequence transmitting module forgenerating and transmitting a preamble sequence according to theselected random access resource; a random access response detectionmodule for detecting a random access response transmitted by a basestation; a Message 3 generating and transmitting module for generatingand transmitting a Message 3 according to the detected random accessresponse and the indication of the number of beams that the UE has; anda contention resolution receiving module for receiving contentionresolution information.

Wherein the random access configuration information may include randomaccess channel time-frequency resources allocated to UEs havingdifferent numbers of the beams or preamble sequence resource poolinformation allocated to UEs having the numbers of beams, and whereinthe selected random access resource may include the random accesschannel time-frequency resource suitable for the number of beams thatthe UE has or the preamble sequence resource suitable for the number ofbeams that the UE has.

Wherein the random access channel time-frequency resources may bedivided into M non-overlapping subsets, each subset corresponds to oneof beam-numbers, where the M non-overlapping subsets correspond to 0 toM−1 beams respectively, when the number of beams that the UE has isbetween 0 and M−2, the time-frequency resource corresponding to thenumber of the beams is selected directly, and when the number of beamsthat the UE has is M−1 or more, the time-frequency resourcecorresponding to the number of beams M−1 are selected.

Wherein the preamble sequence pool may be divided into M disjointsubsets, each of the subsets corresponds to a value indicated by one ofbeam-numbers, and the preamble sequence is selected from the preamblesequence subset corresponding to the number of beams that the UE has,according to the number of beams that the UE has, and the selectedpreamble sequence is transmitted on the random access channel.

Wherein the preamble sequence may be transmitted using a plurality ofdifferent beam directions on a plurality of different random accesschannels.

According to an aspect of the present disclosure, a method for randomaccess of a base station is provided, the method comprises: allocatingrandom access resources to UEs having different numbers of beams,wherein the random access resources include different random accesschannel time-frequency resources or different preamble sequenceresources, and notifying the UEs of them; detecting transmission of apreamble sequence from a UE; determining the number of beamscorresponding to the random access channel time-frequency resource orthe preamble sequence used by the UE, according to the preamble sequencesubset to which the detected preamble sequence from the UE belongs;generating and transmitting a random access response for the detectedpreamble sequence; detecting transmission of a Message 3; and generatingand transmitting a contention resolution message.

Wherein random access channel time-frequency resources of the UEs may beallocated by dividing the random access channel time-frequency resourcesinto M non-overlapping subsets, each subset corresponds to one of thebeam-numbers, wherein M subsets correspond to 0 to M−1 beamsrespectively.

Wherein the preamble sequences of the UEs may be allocated by dividing apreamble sequence pool into M disjoint subsets, each subset correspondsto one of the numbers of beams, and the UEs are notified of an indexrange of possible preamble sequences in each preamble sequence subset byone of the following ways: way 1: indicating a starting preamblesequence index of the first preamble sequence subset and the number ofpreamble sequences in each preamble sequence subset; way 2: indicating astarting preamble sequence index of each preamble sequence subset and atotal number of the preamble sequences; way 3: indicating the startingpreamble sequence index of the first preamble sequence subset and thelast preamble sequence index of each preamble sequence subset; way 4:indicating the starting preamble sequence index of each preamblesequence subset and the number of the preamble sequences of eachpreamble sequence subset; way 5: indicating the starting preamblesequence index and the last preamble sequence index of each preamblesequence subset; and way 6: indicating a first sequence index in a basicsequence resource pool, a number of the sequences in the basic sequenceresource pool, and the index range of available covering codes, whereinthe preamble sequence subset of the UE is formed as follows: for the Msubsets, M covering codes and one basic sequence resource pool aredefined or preset, and the mth preamble sequence subset consists of thebasic sequence resource pool and the mth covering code.

The base station may configure the CSI-RS or SRS corresponding to thedetermined number of the beams for the UE according to the determinednumber of the beams and transmit the configured CSI-RS or SRS to the UE.

Compared with the prior art, with the method provided by the presentdisclosure, a base station can learn the number of beams that a UE haswhen the base station accesses the UE, and therefore, in the subsequentoperation, the number of beams that the UE has can be used to improvethe system operating efficiency. For example, the base station can moreeffectively allocate SRS, CSI-RS or other time-frequency resources forthe UE in a multi-beam operation, and perform operations such as beammanagement and beam direction correction more effectively. Throughinteraction between base stations, the base stations can moreeffectively complete cell handover and other processes.

According to one aspect, an embodiment of the present invention providesa method for notifying information, which is executed by a base station(BS), comprising:

-   -   receiving an uplink signal transmitted by a user equipment (UE);    -   determining the uplink beam to be used by the UE and/or the        timing advance (TA) information corresponding to the uplink beam        to be used by the UE according to the uplink signal;    -   and

transmitting beam indication information and/or the TA information tothe UE, wherein, the beam indication information indicates the uplinkbeam to be used by the UE.

According to another aspect, an embodiment of the present inventionfurther provides another method for notifying information, which isexecuted by a user equipment (UE), comprising:

-   -   transmitting an uplink signal to a base station (BS);    -   receiving the beam indication information and/or the timing        advance (TA) information transmitted by the BS, and determining        the uplink beam to be used and/or TA information corresponding        to the uplink beam to be used according to the beam indication        information and/or the TA information;    -   transmitting the uplink signal to the BS by using the determined        uplink beam to be used and/or the determined TA information        corresponding to the determined uplink beam to be used.

According to another aspect, an embodiment of the present inventionprovides a base station, including:

-   -   a first receiving module configured to receive an uplink signal        transmitted by a user equipment (UE);    -   a first determining module configured to determine the uplink        beam to be used by the UE and/or the timing advance (TA)        information corresponding to the uplink beam to be used by the        UE according to the uplink signal received by the first        receiving module; and    -   a first transmitting module configured to transmit the beam        indication information and/or the TA information determined by        the first determining module to the UE, wherein, the beam        indication information indicates the uplink beam to be used by        the UE.

According to another aspect, an embodiment of the present inventionprovides a user equipment, including:

-   -   a second transmitting module configured to transmit an uplink        signal to the base station (BS);    -   a second receiving module configured to receive the beam        indication information and/or the timing advance (TA)        information transmitted by the B S;    -   a second determining module configured to determine the uplink        beam to be used and/or the TA information corresponding to the        uplink beam to be used according to the beam indication        information and/or the TA information received by the second        receiving module;    -   the second transmitting module is further configured to transmit        the uplink signal to the BS by using the determined uplink beam        to be used and/or the determined TA information corresponding to        the determined uplink beam to be used determined by the second        determining module.

The present invention provides a UE, a BS and a method for notifyinginformation notification. Compared with the prior art, the UE in thepresent invention transmits an uplink signal to the BS, and the BS candetermine an uplink beam to be used by the UE and/or TA informationcorresponding to the uplink beam to be used according to the uplinksignal, and transmit the beam indication information carrying the uplinkbeam to be used and/or the TA information corresponding to the uplinkbeam to be used to the UE so that the UE can transmit the uplink signalaccording to the uplink beam and/or the corresponding TA information(i.e. the uplink beam corresponding to the UE which can be determined bythe BS and/or the TA information changed as the uplink beam changes),and can notify the UE of the determined uplink beam and/or thecorresponding TA information, so that the UE can be notified of a new TAinformation.

The present invention provides a method and device for acquiringconfiguration of timing advance, and a method and device for configuringtiming advance. The configuration of initial Timing Advance (TA)information with a fixed number of bits is used, but the granularity isdetermined by the format of the random access preamble. That is, thegranularity for the TA configuration is associated with the cell radiusdetermined by the format of the random access preamble. Meanwhile,during the subsequent data transmission, the granularity for the TAinformation adjustment amount is determined according to the usedsubcarrier interval.

The present invention provides a method for acquiring configuration oftiming advance, comprising steps of:

-   -   acquiring random access configuration information and        transmitting a random access preamble according to the random        access configuration information;    -   detecting a random access response and acquiring first timing        advance configuration information carried in the random access        response; and    -   determining second timing advance configuration information        according to the random access configuration information and/or        the first timing advance configuration information, and        determining timing advance according to the second timing        advance configuration information.

Preferably, random access preamble configuration information is carriedin the random access configuration information, and the determiningsecond timing advance configuration information according to the randomaccess configuration information and/or the first timing advanceconfiguration information comprises steps of:

-   -   determining timing advance interval configuration information        according to the random access preamble configuration        information; and    -   determining second timing advance configuration information        according to the timing advance interval configuration        information and/or the first timing advance configuration        information.

Preferably, timing advance interval configuration information isdetermined according to the random access preamble configurationinformation, wherein the random access preamble configurationinformation and the timing advance interval configuration informationsatisfy a predetermined mapping rule.

Preferably, the step of determining the second timing advanceconfiguration information according to the random access configurationinformation and/or the first timing advance configuration informationcomprises steps of:

-   -   preconfiguring a mapping rule between reference random access        preamble configuration information and timing advance interval        configuration information, and determining the timing advance        interval configuration information according to a proportional        relation between the random access preamble configuration        information and the reference random access preamble        configuration information and the mapping rule; and    -   the random access preamble configuration information is random        access preamble subcarrier interval information.

Preferably, random access preamble configuration information is carriedin the random access configuration information, and the determiningsecond timing advance configuration information according to the randomaccess configuration information and/or the first timing advanceconfiguration information comprises steps of:

-   -   determining timing advance configuration bit length information        according to the random access preamble configuration        information; and    -   determining second timing advance configuration information        according to the timing advance configuration bit length        information and/or the first timing advance configuration        information.

Preferably, the timing advance configuration bit length information isdetermined according to the random access preamble configurationinformation, wherein the random access preamble configurationinformation and the timing advance configuration bit length informationsatisfy a predetermined mapping rule.

Preferably, the random access preamble configuration information isspecifically random access preamble format information and/or randomaccess preamble subcarrier interval information.

Preferably, first index information is carried in the random accessconfiguration information, and the determining second timing advanceconfiguration information according to the random access configurationinformation and/or the first timing advance configuration informationcomprises steps of:

-   -   acquiring timing advance interval configuration information        corresponding to the first index information according to the        first index information; and    -   determining second timing advance configuration information        according to the timing advance interval configuration        information and/or the first timing advance configuration        information.

Preferably, the second index information is carried in the random accessconfiguration information, and the determining second timing advanceconfiguration information according to the random access configurationinformation and/or the first timing advance configuration informationcomprises steps of:

-   -   acquiring timing advance configuration bit length information        corresponding to the second index information according to the        second index information; and    -   determining second timing advance configuration information        according to the timing advance configuration bit length        information and/or the first timing advance configuration        information.

Preferably, the step of determining timing advance according to thesecond timing advance configuration information comprises a step of:

-   -   determining timing advance according to the first timing advance        configuration information, the determined timing advance        configuration bit length information, and the timing advance        interval configuration information determined according to the        random access configuration information.

Preferably, the method further comprises steps of:

-   -   receiving timing advance adjustment indication information        transmitted by a base station;    -   determining timing advance adjustment amount configuration        information according to the timing advance adjustment        indication information and preconfigured uplink data        transmission subcarrier spacing information;    -   determining timing advance adjustment amount information        according to the uplink data transmission subcarrier spacing        information and the determined timing advance adjustment amount        configuration information; and    -   wherein the preconfigured uplink data transmission subcarrier        spacing information is specifically uplink data transmission        subcarrier spacing information preconfigured by a terminal or        received uplink data transmission subcarrier spacing information        which is preconfigured and then transmitted by a base station.

Preferably, the step of determining timing advance adjustment amountinformation according to the uplink data transmission subcarrier spacinginformation and the timing advance adjustment amount configurationinformation specifically comprises steps of:

-   -   inquiring a third associative mapping list according to the        uplink data transmission subcarrier spacing information to        acquire timing advance adjustment amount interval information        corresponding to the uplink data transmission subcarrier spacing        information in the third associative mapping list; and    -   determining timing advance adjustment amount information        according to the timing advance adjustment amount interval        information and the timing advance adjustment amount        configuration information.

Preferably, the method further comprises steps of:

-   -   determining the adjusted timing advance according to the timing        advance adjustment amount information and the determined timing        advance;    -   Preferably, the process in the random access process is        specifically the process in the contention-free random access        process.

Preferably, the method further comprises steps of:

Msg3 is transmitted according to uplink authorization informationcarried in the random access response and the determined timing advance.

The present invention provides a method for configuring timing advance,comprising steps of:

-   -   transmitting random access configuration information to a        terminal;    -   receiving a random access preamble transmitted by the terminal        according to the random access configuration information; and    -   performing random access according to the random access        preamble, and transmitting a random access response carrying        first timing advance configuration information so that the        terminal determines timing advance according to the first timing        advance configuration information and/or the random access        configuration information.

Preferably, the method further comprises steps of:

First index information is carried in the random access configurationinformation so that the terminal acquires corresponding timing advanceinterval configuration information according to the first indexinformation.

Preferably, the method further comprises steps of:

Second index information is carried in the random access configurationinformation so that the terminal acquires corresponding timing advanceconfiguration bit length information according to the second indexinformation.

The present invention provides a device for acquiring configuration oftiming advance, comprising:

-   -   a first processing unit configured to acquire random access        configuration information and transmit a random access preamble        according to the random access configuration information;    -   a second processing unit configured to detect a random access        response and acquire first timing advance configuration        information carried in the random access response; and    -   a third processing unit configured to determine second timing        advance configuration information according to the random access        configuration information and/or the first timing advance        configuration information, and determine timing advance        according to the second timing advance configuration        information.

The present invention provides a device for configuring timing advance,comprising:

-   -   a transmitting unit configured to transmit random access        configuration information to a terminal;    -   a receiving unit configured to receive a random access preamble        transmitted by the terminal according to the random access        configuration information; and    -   a processing unit configured to perform random access according        to the random access preamble, and transmit a random access        response carrying first timing advance configuration information        so that the terminal determines timing advance according to the        first timing advance configuration information and/or the random        access configuration information.

The present invention further provides a terminal apparatus comprising amemory and a first processor, wherein the memory is configured to storecomputer programs that, when executed by the first processor, implementsteps of a method for acquiring configuration of timing advance asdescribed above.

The present invention further provides a base station comprising amemory and a second processor, wherein the memory is configured to storecomputer programs that, when executed by the second processor, implementsteps of a method for acquiring configuration of timing advance asdescribed above.

Compared with the prior art, the present invention has, but is notlimited to, the following technical effects: a signaling configured byTA information can more effectively notify TA information, and differentcell radiuses and different subcarrier spacing information can besupported, so that the running efficiency of the system is improved.

According to this method, the user equipment UE measures a signal of atarget cell and then the UE sends a measurement report on the signal ofthe target cell to a network node corresponding to a serving cell. TheUE receives a handover command including resource configurationinformation for random access from the network node. The UE performsrandom access to the target cell based on the resource configurationinformation. With the solution of the above embodiment of the presentdisclosure, the performance of the UE randomly accessing the target cellcan be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

For a better understanding of the present invention, the presentinvention will be described in detail according to the followingaccompanying drawings, in which:

FIG. 1 illustrates a schematic flowchart of a process forcontention-based random access;

FIG. 2 illustrates a schematic flowchart of a random access methodaccording to an exemplary embodiment of the present disclosure;

FIG. 3 illustrates a schematic diagram of selecting a random accesschannel by a UE according to an exemplary embodiment of the presentdisclosure;

FIG. 4 illustrates a schematic flowchart of a method for performingrandom access at a UE according to another exemplary embodiment of thepresent disclosure;

FIG. 5 illustrates a schematic structural diagram of a device accordingto an exemplary embodiment of the present disclosure; and

FIG. 6 illustrates a signal flow diagram between devices to which amethod according to an exemplary embodiment of the present disclosure isapplied.

FIG. 7A is a flow chart illustrating a UE side processing procedure inan information generation method in accordance with various embodimentsof the present disclosure;

FIG. 7B is a flow chart illustrating a base station side processingprocedure in an information generation method in accordance with variousembodiments of the present disclosure;

FIG. 8 is a schematic diagram illustrating a mapping relationshipbetween DL transmission beams and random access time-frequency resourcesin embodiment one of the present disclosure;

FIG. 9 is a schematic diagram illustrating preamble groups correspondingto random access resources in embodiment one;

FIG. 10 is a schematic diagram illustrating a mapping relationshipbetween synchronizing signal blocks and random access resources inembodiment two;

FIG. 11 is a diagram illustrating preamble groups corresponding torandom access resources in embodiment two;

FIG. 12 is a diagram illustrating a mapping relationship between DLTransmission beams and random access time-frequency resources inembodiment four;

FIG. 13 is a diagram illustrating preamble groups corresponding torandom access resources in embodiment four;

FIG. 14 is a diagram illustrating a mapping relationship between DLtransmission beams and random access time-frequency resources inembodiment five;

FIG. 15 is a diagram illustrating preamble groups corresponding torandom access resources in embodiment five;

FIG. 16 is a diagram illustrating basic structure of a UE for generatinginformation in accordance with an embodiment of the present disclosure;and

FIG. 17 is a diagram illustrating basic structure of a base station forgenerating information in accordance with an embodiment of the presentdisclosure;

FIG. 18 shows a process of interaction between a base station and a UEin Embodiment ten.

FIG. 19 shows the structure of Message 3 using Mode 1.

FIG. 20 is a schematic diagram of an apparatus for random access of a UEin Embodiment ten.

FIG. 21 is a schematic diagram of a possible resource allocation (timedomain distinction).

FIG. 22 is a schematic diagram of a possible resource allocation(frequency domain distinction).

FIG. 23 is a schematic diagram of a possible resource allocation(time-frequency distinction).

FIG. 24 shows a possible preamble sequence resource pool configurationand notification way.

FIG. 25 shows another possible preamble sequence resource poolconfiguration and notification way.

FIG. 26 shows the structure of the preamble sequence using the coveringcode.

FIG. 27 shows the configuration of the preamble sequence using thecovering code.

FIG. 28 is a schematic diagram of an interaction process between a basestation and a UE in Embodiment eleven.

FIG. 29 is a flowchart of a base station adjusting a random accessresource allocated to UEs having different numbers of beams in realtime.

FIG. 30 is a schematic diagram of an apparatus for random access of a UEaccording to Embodiment eleven.

FIG. 31 is a schematic diagram of an apparatus for allocating randomaccess resources of a base station according to Embodiment eleven.

FIG. 32 is a schematic diagram of configuring a CSI-RS by a base stationaccording to a reported beam number.

FIG. 33 is a schematic diagram of an apparatus for random access of abase station according to this embodiment;

FIG. 34 is a flowchart of a method for notifying information accordingto an embodiment of the present invention;

FIG. 35 is an exemplary diagram that there is an overlap betweenservices with different priorities;

FIG. 36 is an exemplary diagram that there are overlaps between serviceswith a same priority;

FIG. 37 is an exemplary diagram that fixed sizes respectively indicatesTA or TA adjustment;

FIG. 38 is an exemplary diagram that an MAC CE includes a TA;

FIG. 39 is an exemplary diagram that an MAC CE includes a contentindication;

FIG. 40 is an apparatus structure diagram of a base station in anembodiment of the present invention;

FIG. 41 is an apparatus structure diagram of a user equipment in anembodiment of the present invention.

FIG. 42 is a schematic diagram of the purpose of Timing Advance (TA) inthe prior art;

FIG. 43 is a schematic flowchart of a method for configuring TAaccording to the present invention;

FIG. 44 is a detailed schematic flowchart of a method for acquiringconfiguration of TA on a terminal side according to the presentinvention;

FIG. 45 is a detailed schematic flowchart of a method for configuring TAon a base station side according to the present invention;

FIG. 46 is a structure diagram of a device for acquiring configurationof TA on a terminal side according to the present invention; and

FIG. 47 is a structure diagram of a device for configuring TA on a basestation side according to the present invention.

DETAILED DESCRIPTION

In order to enable the objectives, technical solutions, and advantagesof the present disclosure to be clearer, the present disclosure will bedescribed below in further details with reference to the accompanyingdrawings. The embodiments described below with reference to the drawingsare exemplary only for the purpose of illustration of the presentdisclosure and are not to be construed as limiting the presentdisclosure. With regard to description of drawings, similar elements maybe marked by similar reference numerals. The terms of a singular formmay include plural forms unless otherwise specified.

It should be understood by those skilled in the art that, unlessotherwise defined, all terms (including technical and scientific terms)used herein have the same meaning as commonly understood by one ofordinary skill in the art to which this disclosure belongs. It will alsobe understood that terms, such as those defined in the generaldictionary, should be interpreted as having a meaning that is consistentwith their meaning in the context of the prior art, and will not beinterpreted in an idealized or overly formal sense, unless specificallydefined herein.

Embodiments of the present invention will be described in detailhereinafter. The examples of these embodiments have been illustrated inthe accompanying drawings throughout which same or similar referencenumerals refer to same or similar elements or elements having same orsimilar functions. The embodiments described with reference to theaccompanying drawings are illustrative, merely used for explaining thepresent invention and should not be regarded as any limitations thereto.

It should be understood by one person of ordinary skill in the art thatsingular forms “a”, “an”, “the”, and “said” may be intended to includeplural forms as well, unless otherwise stated. It should be furtherunderstood that terms “comprise/comprising” used in this specificationspecify the presence of the stated features, integers, steps,operations, elements and/or components, but not exclusive of thepresence or addition of one or more other features, integers, steps,operations, elements, components, and/or combinations thereof. It shouldbe understood that, when a component is referred to as being “connectedto” or “coupled to” another component, it can be directly connected orcoupled to other elements or provided with intervening elementstherebetween. In addition, “connected to” or “coupled to” as used hereincan comprise wireless connection or coupling. As used herein, the term“and/or” comprises all or any of one or more associated listed items orcombinations thereof.

It should be understood by one person of ordinary skill in the art that,unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneperson of ordinary skill in the art to which the present inventionbelongs. It should be further understood that terms, such as thosedefined in commonly used dictionaries, should be interpreted as having ameaning that is consistent with their meanings in the context of theprior art and will not be interpreted in an idealized or overly formalsense unless expressly so defined herein.

FIG. 1 illustrates a schematic flowchart of a process 100 forcontention-based random access in LTE-A. As shown in FIG. 1 , in stepS110, a User Equipment (UE) randomly selects one preamble from apreamble resource pool and sends the preamble to a base station. Thebase station performs correlation detection on the received signal toidentify the preamble transmitted by the UE.

In step S120, the base station sends a random access response (RAR) tothe UE, including a random access preamble identifier, a timing advancecommand determined according to the delay estimation between the UE andthe base station, a temporary Cell-Radio Network Temporary Identifier(C-RNTI), and a time-frequency resource allocated for the next uplinktransmission by the UE.

In step S130, the UE sends a Msg3 to the base station according to theinformation in the RAR. The Msg3 includes information such as a UEterminal identifier (such as S-TMSI, random number, etc.) and RadioResource Control (RRC) connection request, wherein the UE terminalidentifier is unique to the UE and is used to resolve the conflict.

In step S140, the base station sends to the UE a conflict resolutionidentifier, including a UE terminal identifier of the UE that wins inthe conflict resolution. After detecting its own identifier, the UEupgrades the temporary C-RNTI to a C-RNTI and sends an Acknowledgment(ACK) signal to the base station to complete the random access process,and waits for the scheduling by the base station. Otherwise, the UE willstart a new random access process after a time period of delay.

For the contention-free random access process, since the user identifier(C-RNTI in addition to the UE terminal identifier may be included) isknown to the base station, the UE may be allocated a preamble.Therefore, the UE does not need to randomly select the preamble whensending the preamble, but may use the allocated preamble. Afterdetecting the allocated preamble, the base station may send acorresponding random access response, including information such astiming advance and uplink resource allocation. After receiving therandom access response, the UE considers that the uplink synchronizationhas been completed and waits for further scheduling by the base station.Therefore, the contention-free random access process only includes twosteps: sending a preamble; and sending a random access response.

In LTE, the above-described six scenarios use the same random accessprocedure. In a new generation of communication system, there may bemultiple uplinks (UL) that may provide random access channel resources.For the initially accessed UE, it may read the system message to obtainall the available random access channel resource information, and thenselect a random access resource from it. However, for the UE which is tobe handed over, it may measure the signal strength of the target celland feed it back to a serving cell before performing the hand-overrandom access. Based on the measurement report, a network nodecorresponding to the serving cell, such as a NodeB, sends a handovercommand including resource configuration information for random accessto the UE. For example, whether to initiate a handover according to themeasurement report is determined by the serving cell. If it isdetermined to initiate the handover, the UE needs to obtaincorresponding random access channel resource configuration information,and when there are random access channel resources on multiple uplinks,the UE needs a way to obtain its own random access channel resources.

When multiple uplinks are available for the UE to perform random accessin the communication system, for example, when both a primary cell(Pcell) and a secondary cell (Scell) exist, the base station mayconfigure the uplink of which cell the UE uses for random access. On theother hand, in the communication system, a case where there may bemultiple available uplinks is that there is a normal UL and asupplementary UL, and the latter is for UEs with poor channel conditionsin a larger coverage area. Therefore, the UE does not necessarily selectthe uplink according to the indication from the base station. It ispossible that the measurement report on the UE owned by the base stationis not in time, so the most accurate uplink may not be selected forrandom access, which is not advantageous for the UE to realize fasthandover.

In an embodiment of the present invention, a normal uplink may also bereferred to as a first uplink, and a supplementary uplink may also bereferred to as a second uplink.

The present disclosure provides a random access method, a network node,and a UE. When the UE performs the handover operation, it may measurethe target cell first, and the measurement result is fed back to theserving cell. Based on the measurement report, a network nodecorresponding to the serving cell, such as a NodeB, sends a handovercommand including resource configuration information for random accessto the UE. For example, the serving cell determines whether to performhandover based on the measurement report, and notifies the UE of therandom access resource configuration information of the target cell,where the serving cell may directly determine the used uplink and itscorresponding random access resource configuration information.Alternatively, the serving cell may notify the UE of all availableuplinks and corresponding random access resource configurationinformation and a corresponding threshold for determination, and the UEdetermines the selected uplink and its corresponding random accessresource configuration information. In addition, when there is a certaintime interval from a time when the UE obtains the above resourceconfiguration information to the UE actually starts to hand over therandom access, the UE may use the latest measurement result to selectthe uplink and its corresponding random access resources. Therefore, theUE can select the most accurate uplink in time to perform random access.

Hereinafter, a random access method according to a first exemplaryembodiment of the present disclosure will be described in detail withreference to FIG. 2 .

FIG. 2 illustrates a schematic flowchart of a random access method 200according to a first exemplary embodiment of the present disclosure. Asshown in FIG. 2 , in step S210, a network node corresponding to aserving cell (hereinafter referred to as a “network node”) receives ameasurement report on a signal of a target cell from the UE. In someembodiments, the network node may be a base station, an eNB, a NodeB, aradio access network center control unit, a radio access network nodedistribution unit, or the like. The measurement report may include aReference Signal Receiving Power (RSRP) of the target cell obtained bythe UE measuring a Synchronization Signal Block (SSB) or a configuredChannel Status Information-Reference Signal (CSI-RS) of the target cell.In addition, the measurement report may further include an SSB index orCSI-RS index to be fed back to the serving cell. Herein, the UE maydetermine one or more SSB indexes or CSI-RS indexes to be fed back tothe serving cell by a threshold, threshold1, configured by the networknode. In particular, for example, when the UE measures the SSB-basedRSRP (SSB_rsrp), if the SSB_rsrp≥threshold1, the UE records the index ofthe SSB, and notifies the serving cell of the index. The UE may notifythe serving cell of indexes of all M SSBs that satisfy the threshold.Alternatively, the UE may select N (N<M) SSBs from all M SSBs satisfyingthe threshold with equal probability, and notify the serving cell of theindexes thereof. The threshold1 used for the determination and thenumber N to be selected are notified to the UE by the network node. Thecase of using the CSI-RS is similar to that of the SSB, and detailsthereof are not described herein again.

In step S220, the network node sends a handover command includingresource configuration information for random access to the UE based onthe measurement report (e.g., RSRP of the target cell). For example, thenetwork node determines whether the UE is handed over from the servingcell to the target cell. Specifically, the network node may determinewhether the UE needs to perform handover by comparing the RSRP(RSRP_report) reported by the UE with a preset threshold (threshold_HO).For example, if RSRP_report>threshold_HO, it is determined that the UEneeds to be handed over; and if RSRP_report≤threshold_HO, it isdetermined that the UE does not need to be handed over.

If it is determined that the UE needs to be handed over from the servingcell to the target cell, the network node sends to the UE a handovercommand including resource configuration information for random access.The handover command may be notified to the UE by radio resource control(RRC) signaling such as a Physical Downlink Shared Channel (PDSCH) orDownlink Control Information (DCI) (PDCCH).

In the handover command, the network node notifies the UE of resourceconfiguration information for random access. When there are multipletypes of uplinks that can perform random access to the target cell (thatis, all the uplinks have random access resource configurations), take anormal uplink and a supplementary uplink in the target cell as anexample, where the normal uplink is for UEs with better channel statusconditions, and the supplementary uplink is for UEs with poor channelstatus conditions. When the UE reports the measured RSRP value, the UEdoes not know a threshold, threshold2, used by the target cell todetermine whether to select the normal uplink or the supplementaryuplink. Therefore, the UE cannot determine the configuration informationof the random access resources to be used.

Thus, the resource configuration information notified to the UE by thenetwork node according to an exemplary embodiment of the presentdisclosure may include at least one of:

-   -   1) Random access resource configuration information based on the        normal uplink, which implicitly notifies the UE to perform        random access using the normal uplink; and the UE obtains        available random access time-frequency resource locations        (including a bandwidth part indication (Bandwidth Part), random        access channel resource configuration information) and available        random access preamble resources (root sequence, cyclic shift        value, number of available preambles, etc.) from the obtained        random access resource configuration; and    -   2) Random access resource configuration information based on the        supplementary uplink, which implicitly notifies the UE to        perform random access using the supplementary uplink; and the UE        obtains available random access time-frequency resource        locations (including a bandwidth part indication (Bandwidth        Part), random access channel resource configuration information)        and available random access preamble resources (root sequence,        cyclic shift value, number of available preambles, etc.) from        the obtained random access resource configuration.

Additionally, the resource configuration information may further includeone of the following:

-   -   3) An indication which indicates to the UE whether to use the        normal uplink or the supplementary uplink for random access; and    -   4) The threshold2 for the UE to determine whether to use the        normal uplink or the supplementary uplink for random access. In        this case, the UE may determine whether to use the normal uplink        for random access or use the supplementary uplink for random        access by comparing the reported RSRP (RSRP_report) of the        target cell with the threshold2. For example, if        RSRP_report>threshold2, the UE chooses to use the normal uplink        and determines the selected random access resource from the        corresponding random access resource configuration information;        and if RSRP_report≤threshold2, the UE chooses to use the        supplementary uplink and determines the selected random access        resource from the corresponding random access resource        configuration information.

The above resource configuration information may be included in resourceconfiguration information, which is configured by the target cell insystem information thereof that may be used for the UE to perform thecontention-based random access. That is, the above resourceconfiguration information may be included in the resource configurationinformation sent by the network node to the UE for the contention-basedrandom access. In addition, the above resource configuration informationmay be further included in dedicated random access resource(RACH-ConfigDedicated) configuration information that is additionallynotified by the network node to the UE.

Therefore, if the UE is not configured with a dedicated random accessresource, it selects a random access resource (a random access channeland a random access preamble) through the configured random accessresource configuration information to initiate the contention-basedrandom access. If the UE is configured with a dedicated random accessresource, i.e., the UE is configured with a specific random accessresource (a specific random access channel and/or a specific randomaccess preamble), it uses the configured dedicated random accessresource to initiate the random access. The threshold2 for determiningwhether to select a normal uplink or a supplementary uplink may be putin the dedicated random access resource (RACH-ConfigDedicated)configuration information as follows:

RACH-ConfigDedicated ::=  SEQUENCE {   ra-PreambleIndex   INTEGER(0..63),   ra-PRACH-MaskIndex    INTEGER (0..15)  ra-SUL-ThresholdRSRP-value(threshold2) }

After receiving the above resource configuration information from thenetwork node, the UE may perform all random access uplink transmissions(msg1, msg3, and possibly msg3 retransmissions) within the configured orselected uplink.

Additionally, the handover command sent by the network node to the UEmay further include: a mapping relationship between the SSB reported bythe UE and the corresponding random access resource; or a mappingrelationship between the CSI-RS reported by the UE and the correspondingrandom access resource. Thus, after the UE selects one SSB or CSI-RS,available random access resources may be found through the mappingrelationship with the corresponding random access resource.

FIG. 3 illustrates a schematic diagram of selecting a random accesschannel by a UE according to an exemplary embodiment of the presentdisclosure.

In FIG. 3 , the UE has selected a supplementary uplink based on thedetected RARP value. The UE may then acquire the random access channelresource to be used based on the handover command from the network nodeof the serving cell. The handover command may include a mappingrelationship between the SSB reported by the UE and the correspondingrandom access resource. The handover command may further include athreshold, threshold3, for the UE to select a random access resource.When the UE reports a plurality of available SSBs to the network node,the UE may select an SSB greater than or equal to the threshold3 fromthe plurality of available SSBs before performing random access, andthen find the corresponding random access channel resource through theselected SSB and the mapping relationship between the SSB and the randomaccess channel. For example, the UE finds a corresponding random accesschannel resource (random access channel resource 2 as shown in FIG. 3 )from a selected SSB (SSB2 as shown in FIG. 3 ) through a mappingrelationship (for example, a one-to-one mapping) between the SSBnotified by the network node of the serving cell and the random accesschannel. The random access channel resource may include available randomaccess preamble resources, random access channels, time-frequencyresources or the like. The threshold3 may be notified to the UE in therandom access channel resource configuration, or may be notified to theUE through a UE-dedicated random access configuration.

Afterwards, the UE obtains a determined random access preamble from thededicated random access resource indication, so as to determine therandom access resource. It should be noted that, although a one-to-onemapping is taken as an example herein, the mapping relationship betweenthe SSB and the random access channel is not limited to this, and may bea one-to-multiple mapping or a multiple-to-one mapping. The case ofusing the CSI-RS is similar to that of the SSB, and details thereof arenot described herein again.

Hereinafter, a method for performing random access at a UE according toa second exemplary embodiment of the present disclosure will bedescribed in detail with reference to FIG. 4 .

FIG. 4 illustrates a schematic flowchart of a method 400 for performingrandom access at a UE according to a second exemplary embodiment of thepresent disclosure. As shown in FIG. 4 , in step S410, the UE measures asignal of a target cell. In step S420, the UE sends a measurement reporton the signal of the target cell to a network node corresponding to aserving cell. The measurement report may include a Reference SignalReceiving Power (RSRP) of the target cell obtained by the UE measuring aSynchronization Signal Block (SSB) or a configured Channel StatusInformation-Reference Signal (CSI-RS) of the target cell. In addition,the measurement report may further include an SSB index or CSI-RS indexto be fed back to the serving cell. Herein, the UE may determine one ormore SSB indexes or CSI-RS indexes to be fed back to the serving cell bya threshold, threshold1, configured by the network node. In particular,for example, when the UE measures the SSB-based RSRP (SSB_rsrp), if theSSB_rsrp>threshold1, the UE records the index of the SSB, and notifiesthe serving cell of the index. The UE may notify the serving cell ofindexes of all M SSBs that satisfy the threshold. Alternatively, the UEmay select N (N<M) SSBs from all M SSBs satisfying the threshold withequal probability, and notify the serving cell of the indexes thereof.The threshold1 used for the determination and the number N to beselected are notified to the UE by the network node. The case of usingthe CSI-RS is similar to that of the SSB, and details thereof are notdescribed herein again.

In step S430, the UE receives a handover command including resourceconfiguration information for random access from the network node. Thehandover command may be made by the network node based on a measurementreport (such as the target cell's RSRP) from the UE. Specifically, thenetwork node may determine whether the UE needs to perform handover bycomparing the RSRP (RSRP_report) reported by the UE with a presetthreshold (threshold_HO). For example, if RSRP_report>threshold_HO, itis determined that the UE needs to be handed over; and ifRSRP_report≤threshold_HO, it is determined that the UE does not need tobe handed over. The network node may notify the UE of the handovercommand through Radio Resource Control (RRC) signaling (PDSCH) orDownlink Control Information (DCI) (PDCCH).

In the handover command, the network node notifies the UE of resourceconfiguration information for random access. When there are multipletypes of uplinks that can perform random access to the target cell (thatis, all the uplinks have random access resource configurations), take anormal uplink and a supplementary uplink in the target cell as anexample, where the normal uplink is for UEs with better channel statusconditions, and the supplementary uplink is for UEs with poor channelstatus conditions. When the UE reports the measured RSRP value, the UEdoes not know a threshold, threshold2, used by the target cell todetermine whether to select the normal uplink or the supplementaryuplink. Therefore, the UE cannot determine the configuration informationof the random access resources to be used.

Thus, the resource configuration information notified by the networknode to the UE according to an exemplary embodiment of the presentdisclosure may include one of the following:

-   -   1) Random access resource configuration information based on the        normal uplink, which implicitly notifies the UE to perform        random access using the normal uplink; and the UE obtains        available random access time-frequency resource locations        (including a bandwidth part indication (Bandwidth Part), random        access channel resource configuration information) and available        random access preamble resources (root sequence, cyclic shift        value, number of available preambles, etc.) from the obtained        random access resource configuration;    -   2) Random access resource configuration information based on the        supplementary uplink, which implicitly notifies the UE to        perform random access using the supplementary uplink; and the UE        obtains available random access time-frequency resource        locations (including a bandwidth part indication (Bandwidth        Part), random access channel resource configuration information)        and available random access preamble resources (root sequence,        cyclic shift value, number of available preambles, etc.) from        the obtained random access resource configuration.

In addition, the resource configuration information may further includeone of the following:

-   -   3) An indication which indicates to the UE whether to use the        normal uplink or the supplementary uplink for random access; and    -   4) The threshold2 for the UE to determine whether to use the        normal uplink or the supplementary uplink for random access. In        this case, the UE may determine whether to use the normal uplink        for random access or use the supplementary uplink for random        access by comparing the reported RSRP (RSRP_report) of the        target cell with the threshold2. For example, if        RSRP_report>threshold2, the UE chooses to use the normal uplink        and determines the selected random access resource from the        corresponding random access resource configuration information;        and if RSRP_report≤threshold2, the UE chooses to use the        supplementary uplink and determines the selected random access        resource from the corresponding random access resource        configuration information.

The above resource configuration information may be included in resourceconfiguration information, which is configured by the target cell insystem information thereof that may be used for the UE to perform thecontention-based random access. That is, the above resourceconfiguration information may be included in the resource configurationinformation sent by the network node to the UE for the contention-basedrandom access. In addition, the above resource configuration informationmay be further included in dedicated random access resource(RACH-ConfigDedicated) configuration information that is additionallynotified by the network node to the UE.

Therefore, if the UE is not configured with a dedicated random accessresource, it selects a random access resource (a random access channeland a random access preamble) through the configured random accessresource configuration information to initiate the contention-basedrandom access. If the UE is configured with a dedicated random accessresource, i.e., the UE is configured with a specific random accessresource (a specific random access channel and/or a specific randomaccess preamble), it uses the configured dedicated random accessresource to initiate the random access. The threshold2 for determiningwhether to select a normal uplink or a supplementary uplink may be putin the dedicated random access resource (RACH-ConfigDedicated)configuration information as follows:

RACH-ConfigDedicated ::=  SEQUENCE {   ra-PreambleIndex   INTEGER(0..63),   ra-PRACH-MaskIndex    INTEGER (0..15)  ra-SUL-ThresholdRSRP-value(threshold2) }

After receiving the above resource configuration information from thenetwork node, in step S440, the UE may obtain the random access resourceconfiguration and indication, and perform random access to the targetcell based on the random access resource configuration and indication.For the above cases 1), 2) and 3), the UE performs random accessaccording to the normal uplink or supplementary uplink indicated by thenetwork node. For the above case 4), the UE selects a correspondingrandom resource configuration (i.e., a normal uplink or supplementaryuplink) by itself according to the threshold2 included in the resourceconfiguration information sent by the network node, and determines therandom resource to be used. In one exemplary embodiment, the UE mayperform a new downlink measurement to the target cell and obtain a newRSRP (RSRP_latest) when the UE actually performs a random access ofhandover, and the RSRP_latest might not be the same as the RSRP_report.In this case, if RSRP_latest>threshold2, the UE chooses to use thenormal uplink and determines the selected random access resource fromthe corresponding random access resource configuration information; andif RSRP_latest≤threshold2, the UE chooses to use the supplementaryuplink and determines the selected random access resource from thecorresponding random access resource configuration information.

Additionally, the handover command sent by the network node to the UEmay further include: a mapping relationship between the SSB reported bythe UE and the corresponding random access resource; or a mappingrelationship between the CSI-RS reported by the UE and the correspondingrandom access resource. Thus, after the UE selects one SSB or CSI-RS,available random access resources may be found through the mappingrelationship with the corresponding random access resource. The mannerin which the UE selects a random access channel according to anexemplary embodiment of the present disclosure has been described indetail above with reference to FIG. 3 , and details thereof are notdescribed herein again.

Hereinafter, a schematic structure of a device according to an exemplaryembodiment of the present disclosure will be described with reference toFIG. 5 . FIG. 5 is a schematic structural diagram of a device 500according to an exemplary embodiment of the present disclosure. Thedevice 500 may be used to execute the methods 200 and 400 described withreference to FIGS. 2 and 4 . For the sake of simplicity, a schematicstructure of a device according to an exemplary embodiment of thepresent disclosure is described herein, but details that have beenalready described in detail in the methods described previously withreference to FIGS. 2 and 4 are omitted.

As shown in FIG. 5 , the device 500 may include a communicationinterface 501 for external communication, a processing unit or processor503, which may be a single unit or a combination of multiple units forperforming different steps of the method, and a memory 505, in whichcomputer-executable instructions are stored.

According to the first exemplary embodiment, the instructions, whenexecuted by the processor 503, cause the processor 503 to: receive ameasurement report on a signal of a target cell from a user equipment UE(as described in step S210, which is not described herein again); andsend a handover command including resource configuration information forrandom access to the UE based on the measurement report (as described instep S220, which is not described herein again). As such, the device 500may be embodied as a network node that executes the method 200 aspreviously described with reference to FIG. 2 .

According to the second exemplary embodiment, the instructions, whenexecuted by the processor 503, cause the processor 503 to: measure asignal of a target cell (as described in step S410, which is notdescribed herein again); send a measurement report on the signal of thetarget cell to a network node corresponding to a serving cell (asdescribed in step S420, which is not described herein again); receive ahandover command including resource configuration information for randomaccess from the network node (as described in step S430, which is notdescribed herein again); and perform random access to the target cellbased on the resource configuration information (as described in stepS440, which is not described herein again). As such, the device 500 maybe embodied as a user equipment (UE) that executes the method 400 aspreviously described with reference to FIG. 4 .

Hereinafter, inter-device messaging according to the method of anexemplary embodiment of the present disclosure will be described withreference to FIG. 6 .

FIG. 6 illustrates a signal flow diagram between devices to which amethod 600 according to an exemplary embodiment of the presentdisclosure is applied.

In step S610, the user equipment (UE) measures the signal of the targetcell. The measurement may be a measurement of a reference signalreceiving power (RSRP) of the target cell based on a synchronizationsignal block (SSB) or a configured channel status information-referencesignal (CSI-RS) of the target cell.

Afterwards, in step S620, the UE sends the measurement report to thenetwork node through the uplink channel, for example, the measured RSRPvalue of the target cell.

In step S630, the network node reads the measurement report from the UEand determines from the measurement report that the UE needs to behanded over from the serving cell to the target cell. The determinationregarding the handover operation has been described in detail in thefirst exemplary embodiment and the second exemplary embodiment above,and details thereof are not described herein again.

When the network node determines that the UE needs to be handed over, instep S640, the network node sends a handover command to the UE throughthe downlink channel. In the handover command, the network node notifiesthe UE of resource configuration information for random access. Whenthere are multiple types of uplinks that can perform random access tothe target cell (that is, all the uplinks have random access resourceconfigurations), take a normal uplink and a supplementary uplink in thetarget cell as an example, where the normal uplink is for UEs withbetter channel status conditions, and the supplementary uplink is forUEs with poor channel status conditions. When the UE reports themeasured RSRP value, the UE does not know a threshold, threshold2, usedby the target cell to determine whether to select the normal uplink orthe supplementary uplink. Therefore, the UE cannot determine theconfiguration information of the random access resources to be used.

Thus, the resource configuration information notified by the networknode to the UE according to an exemplary embodiment of the presentdisclosure may include one of the following:

-   -   1) Random access resource configuration information based on the        normal uplink, which implicitly notifies the UE to perform        random access using the normal uplink; and the UE obtains        available random access time-frequency resource locations        (including a bandwidth part indication (Bandwidth Part), random        access channel resource configuration information) and available        random access preamble resources (root sequence, cyclic shift        value, number of available preambles, etc.) from the obtained        random access resource configuration;    -   2) Random access resource configuration information based on the        supplementary uplink, which implicitly notifies the UE to        perform random access using the supplementary uplink; and the UE        obtains available random access time-frequency resource        locations (including a bandwidth part indication (Bandwidth        Part), random access channel resource configuration information)        and available random access preamble resources (root sequence,        cyclic shift value, number of available preambles, etc.) from        the obtained random access resource configuration.

In addition, the resource configuration information may further includeone of the following:

-   -   3) An indication which indicates to the UE whether to use the        normal uplink or the supplementary uplink for random access; and    -   4) The threshold2 for the UE to determine whether to use the        normal uplink or the supplementary uplink for random access. In        this case, the UE may determine whether to use the normal uplink        for random access or use the supplementary uplink for random        access by comparing the reported RSRP (RSRP_report) of the        target cell with the threshold2. For example, if        RSRP_report>threshold2, the UE chooses to use the normal uplink        and determines the selected random access resource from the        corresponding random access resource configuration information;        and if RSRP_report≤threshold2, the UE chooses to use the        supplementary uplink and determines the selected random access        resource from the corresponding random access resource        configuration information.

The above resource configuration information may be included in resourceconfiguration information, which is configured by the target cell in thesystem information thereof that may be used for the UE to perform thecontention-based random access. That is, the above resourceconfiguration information may be included in the resource configurationinformation sent by the network node to the UE for the contention-basedrandom access. In addition, the above resource configuration informationmay be further included in dedicated random access resource(RACH-ConfigDedicated) configuration information that is additionallynotified by the network node to the UE.

After receiving the above resource configuration information from thenetwork node, in step S650, the UE may obtain the random access resourceconfiguration and indication from the resource configurationinformation. For the above cases 1), 2) and 3), the UE performs randomaccess according to the normal uplink or supplementary uplink indicatedby the network node. For the above case 4), the UE selects acorresponding random resource configuration (i.e., a normal uplink orsupplementary uplink) by itself according to the threshold2 included inthe resource configuration information sent by the network node, anddetermines the random resource to be used.

It can be seen from the above technical solution that when the UEperforms a handover operation, the UE may measure the target cell andfeed the measurement result back to the network node of the servingcell. The network node may determine whether to perform the handover andnotify the UE of the target cell's random access resource configurationinformation, where used uplink and its corresponding random accessresource configuration information may be directly determined by thenetwork node, or all available uplinks and corresponding random accessresource configuration information and a threshold for the correspondingdetermination may be notified to the UE by the network node, and thenthe UE determines the selected uplink and its corresponding randomaccess resource configuration information. In addition, when there is acertain time interval from a time when the UE obtains the above resourceconfiguration information to the UE actually starts to hand over therandom access, the UE may use the latest measurement result to selectthe uplink and its corresponding random access resources. Therefore, theUE can select the most accurate uplink in time to perform random access.

In the future fifth-Generation (5G) communication system, the networkmay use a beam forming system and the base station may transmit signalsto the user adopting different DL transmission beams. Since transmissionperformances of different DL transmission beams are different, the usermay select a DL transmission beam with better reception effect frommultiple different DL transmission beams according to detection on theDL signals and notify the base station of the selected DL transmissionbeam. Therefore, the base station may use this DL transmission beam totransmit signals to the user in subsequent transmission to improvetransmission performances. In the 5G communication system, multiple DLtransmission beams may be bound with a same random access time-frequencyresource. Then, in order to make the network side distinguish the DLtransmission beam selected by the user via detected resources andpreambles, available random access preambles may be grouped anddifferent group indexes may be bound with different DL transmissionbeams. However, if existing RA-RNTI generation method is used, the usermay make extra waste on detecting random preambles of other groups.

In order to solve the above problem, an embodiment of the presentdisclosure may provide an information generation method, which may use anew mode to generate the RA-RNTI. In a multi-beam transmission system,the system may transmit information such as broadcast messages orsynchronization signals via multiple DL transmission beams. Meanwhile,multiple DL transmission beams may be bound with the same random accessresource. In this random access resource, random access preambles mayneed to be grouped and different groups may be used to indicatedifferent DL transmission beams. An embodiment of the present disclosuremay provide a new method for constructing and generating an RA-RNTI. TheRA-RNTI may be calculated and generated using time-frequency resourcelocations used by the random access and an index of a group, at whichthe selected preamble may be located. Therefore, when the user searchesthe possible RARs, RARs that use the same time-frequency resource andbelong to different preamble groups may be automatically excluded viathe generated RA-RNTI to save users' search overhead and delay. Whilethe base station may distinguish and select users of different DLtransmission beams using different RA-RNTIs in the RAR via the detectedrandom access preambles.

After a user reads configuration information of the random access viathe DL channel and obtains the corresponding random accesstime-frequency resources and corresponding random access preamble (i.e.,the random access preamble sequence) groups, the user may send therandom access preambles on the selected random access time-frequencyresources. In a period after the preambles are transmitted, the user maysearch a possible RAR according to length of a RAR window and the RARmay be indicated by the RA-RNTI. Different from the traditional mode,the calculation mode provided by embodiments of the present disclosuremay be associated with a resource location of a given Physical RandomAccess Channel (PRACH) and indexes of groups of available random accesspreamble groups on the PRACH.

In different systems, the resource locations of PRACH used forcalculating the RA-RNTI may be different.

In the 5G system, the corresponding resource location may include indexinformation t_id of a starting time unit and index information f_id of astarting frequency unit of the PRACH, which may be used for transmittingthe random access preambles. The index information t_id of the startingtime unit may be an index value of the time unit, at which a startinglocation of the PRACH may be located, such as the starting sub-frameindex in a radio frame, at which the starting location of the PRACH maybe located, and t_id may range from 0 to M, and (0≤t_id<M+1). In analternative, the index information t_id may be determined by indexvalues of multiple time units, at which the starting location of thePRACH may be located, such as may be determined by an index of a radioframe, at which the PRACH may be located, and an index of a sub-frame,at which the PRACH may be located. Similarly, the index information f_idof the frequency unit may be the index value of the frequency unit, atwhich the starting location of the PRACH may be located, such as aPhysical Resource Block (PRB) index of a PRB, at which the startinglocation of the PRACH may be located and f_id may range from 0 to N, and(0≤f_id<N+1). In an alternative, the index information f_id may bedetermined by index values of multiple frequency units, at which thestarting location of the PRACH may be located, such as may be determinedby an index and sub-carrier index of the PRB, at which the PRACH may belocated, and M and N may be nonnegative integers.

In an enhanced Machine Type Communication (eMTC), the correspondingresource location may include index information SFN_id (such as an indexof a first radio frame, at which the PRACH may be located) of a firstfirst-time-unit, at which the PRACH may be located, index informationt_id (such as an sub-frame index of the first radio frame) of a secondtime unit in the first first-time-unit, at which the PRACH may belocated, and index information f_id of a frequency unit, at which thePRACH may be located.

In a Narrow band-Internet of Things (NB-IOT), the corresponding resourcelocation may be an index SFN_id (such as an index of a first radioframe, at which the PRACH may be located) of the first time unit, atwhich the PRACH may be located.

The index of the random access preamble group may include pg_id of arandom access preamble group, to which the transmitted random accesspreamble may belong. The random access preamble group may be only forrandom access time-frequency resources selected by the user and pg_idmay range from 0 to P, (0≤pg_id<P+1), P is a nonnegative integer. Itshould be noted that since the preamble group may be used to notify thebase station of the DL transmission beam selected by the user, thepreamble group may be bound with the DL transmission beam. When theRA-RNTI is calculated, the preamble group index may be an index of a DLTransmission beam, or an index of a Synchronization Signal (SS) block,or an index of a Physical Broadcast Channel (PBCH). Further, besidesdirectly grouping the preamble set, since the preamble set may be formedby different preamble root sequence groups, or formed by the preamblesequence and different Orthogonal Cover Codes (OCC)s, or formed by thepreamble sequence and different Cyclic Shifts (CS)s. Therefore, thepreamble group indexes may be different root sequence group indexes, OCCindexes or different CS indexes.

To sum up, the basic flow of the information generation method inembodiments of the present disclosure may be shown in FIG. 7A and FIG.7B. FIG. 7A may be the processing flow of the UE side and may include:

At block 201 a, a UE may transmit a random access preamble.

At block 202 a, the UE may calculate a RA-RNTI according to an index ofa preamble group, to which the transmitted random access preamble maybelong, and a resource location of a random access resource bearing therandom access preamble. In an embodiment, the resource location of therandom access resource may be the time/frequency location of the randomaccess resource.

The preamble group may be a group of available random access preamblescorresponding to the random access resource. Specifically, the multipleavailable random access preambles corresponding to the random accessresource may be grouped in advance to obtain the preamble groups.

FIG. 7B may be a process flow of the base station side and may include:

At block 201 b, the base station may receive the random access preamble.

At block 202 b, the base station may calculate the RA-RNTI according toan index of a preamble group, to which the received random accesspreamble may belong, and a resource location of a random access resourcebearing the random access preamble.

The preamble group may be a group of available random access preamblescorresponding to the random access resource. Specifically, the multipleavailable random access preambles corresponding to the random accessresource may be grouped in advance to obtain the preamble group.

In a communication system, such as 5G communication system, thecalculation mode of the RA-RNTI may include:

RA-RNTI=1+a*t_id+b*f_id+c*pg_id(1)t_id and f_id may respectivelyrepresent index information of a time unit, at which a starting locationof the random access chancel may locate, and index information of afrequency unit, at which the starting location of the random accesschancel may locate, such as respectively represent a starting locationon the time domain of a radio frame of the random access channel and astarting location on the frequency domain of the radio frame of therandom access channel. In an embodiment, t_id may be a sub-frame index,slot index, mini-slot index, symbol-group index, symbol index, or thatdetermined according to indexes of the multiple time units, such as aslot index in a sub-frame index, or a symbol index in the slot index. Inan embodiment, f_id may be a PRB-group index, PRB index, subcarrierindex, subcarrier group index, or that determined according to indexesof the multiple frequency units, such as the subcarrier index in the PRBindex.

Wherein, a, b and c may respectively be coefficients oft id, f_id andpg_id. Values of a, b and c should satisfy a condition, i.e., theRA-RNTI should only correspond to the value of {t_id, f_id, pg_id}. Thevalue of the RA-RNTI may be calculated using the value of a group of{t_id, f_id, pg_id}. On the contrary, the only value of {t_id, f_id,pg_id} may be calculated using the value of RA-RNTI. A feasible designmay be that the value of a is 1, the value of b is the maximum value of(1+a*t_id) and the value of c is the maximum value of (1+a*t_id+b*f_id),that is

a=1,

b=max{l+a*t_id}=M+1,

c=max{l+a*t_id+b*f_id}=(M+1)(N+1).

Such as, M=9, N=5, therefore, the calculation method of RA-RNTI may be:

RA-RNTI=1+t_id+10*f_id+60*pg_id  (2)

-   -   Therefore, when the value of RA-RNTI is 32, the only value        t_id=1, f_id=3, pg_id=0 may be calculated.

After the UE obtains the RA-RNTI using the method shown in FIG. 7A, theUE may detect the RAR transmitted by the base station. After the basestation obtains the RA-RNTI using the method shown in FIG. 7B, the basestation may scramble the RAR using the RA-RNTI and send the scrambledRAR to the UE.

The RA-RNTI generated with the above method may reflect the DLtransmission beam selected by the user and improve the detectionefficiency of the RAR. The implementation of the methods in embodimentsof the present disclosure may be described via several embodiments.

Embodiment One

In this embodiment, corresponding to the random access resource, theavailable random access preambles may be grouped to obtain preamblegroups and one-to-one binding relationship may be established betweenthe preamble group and the DL transmission beam. Therefore, the randomaccess preamble may be selected from the corresponding preamble groupaccording to the DL transmission beam selected by the user, so that thebase station may distinguish the DL transmission beam selected by the UEaccording to the selected random access preamble.

Specifically, the base station may send broadcast messages andsynchronization signals via different DL transmission beams, whiledifferent DL transmission beams may be bound to the designated randomaccess resource. One situation may be that multiple DL transmissionbeams may be bound to the same random access time-frequency resource. Asshown in FIG. 8 , the DL transmission beam 1 and the DL transmissionbeam 2 may be mapped to the same random access time-frequency resource.

Then, different preamble sets may need to be grouped so that the basestation may obtain the direction of the DL transmission beam selected bythe user via the detection of the random access message 1. Suppose thatX=64 available random access preambles may be set for the DLtransmission beam 1 and DL transmission beam 2. The preamble set may bedivided into two groups. Wherein, the group 0 may include A (A<64)preambles that may be bound with the DL transmission beam direction 1and the group 1 may include B (B<64, A+B≤64) preambles that may be boundwith the DL transmission beam direction 2. When a preamble detected bythe base station on the corresponding random access resource belongs tothe group 0, the base station may be implicitly notified of that theuser transmitting the preamble may select the DL transmission beam 1.Similarly, when a preamble detected by the base station on thecorresponding random access resource belongs to the group 1, the basestation may be implicitly notified of that the user transmitting thepreamble may select the DL transmission beam 2.

It should be noted that the “corresponding random access resource” maybe that the random access resource, into which the one or multiple DLbeams may be mapped. In different random access resources, into whichthe same random access preamble may be mapped, the same random accesspreamble may belong to different preamble groups. As shown in FIG. 9 ,in the random access resources corresponding to the DL transmissionbeams 1 and 2, the preamble set may be divided into two groups. Thepreamble 32 may belong to a preamble group 1, while in the random accessresource corresponding to the DL transmission beam 3, the preamble setmay be divided into one group and the preamble 32 may belong to apreamble group 0.

When the base station successfully detects a random access preamble, thebase station may need to transmit a RAR for the preamble and may need toperform a scrambling operation using the RA-RNTI when transmitting theRAR. For instance, the system may have made a configuration that oneradio frame may include 10 sub-frames, t_id may identify a sub-frameindex and may range from 0 to 9, that is, (0<t_id<10). The frequencydomain of the random access resource may have 6 PRBs, f_id may identifya PRB index and may range from 0 to 5, that is, (0<f_id<6), the RA-RNTImay be calculated using the above equation, i.e.,RA-RNTI=l+t_id+10*f_id+60*pg_id.

When the user detects that signal strength on the DL beam 2 is max (thatis, Reference Signal Receiving Power (RSRP) measured on the DLtransmission beam 2 may be max), the user may select the random accesstime-frequency resource corresponding to the DL beam 2. The startinglocation of the random access time-frequency resource may be the secondsub-frame in time domain and the third PRB in the frequency domain andmay be transmitted using the preamble 32 selected from the preamblegroup 1, that is, t_id=2, f_id=3, pg_id=1. Finally, the base station maysuccessfully detect the random access preamble 32 from the random accesstime-frequency resource, the starting location of which may be thesecond sub-frame in time domain and the third frequency domain locationin the frequency domain, make a RAR for the preamble 32, and execute thescrambling using the RA-RNTI. Then, the value of the RA-RNTI may beRA-RNTI=1+2+10*3+60*1=93.

At the same time, the user may use a same generation mode to generatethe same RA-RNTI value. Therefore, the corresponding Physical DownlinkControl Channel (PDCCH) may be descrambled and possible RARs therein maybe searched.

It can be seen that in this embodiment, the random access resource maybe determined according to the DL transmission beam selected by the UEbased on the DL measurement. The random access preamble transmitted bythe UE may be selected from a preamble group, which may correspond tothe random access resource and may be bound with the DL transmissionbeam selected by the UE based on the DL measurement.

Embodiment Two

In this embodiment, corresponding to the random access resources, theavailable random access preambles may be grouped to obtain preamblegroups and one-to-one binding relationship may be established betweenthe preamble group and a physical broadcast signal or synchronizationsignal. Therefore, the random access preamble may be selected from thecorresponding preamble group to perform random access according to thephysical broadcast signal or synchronization signal selected by theuser, so that the base station may distinguish the DL transmission beamselected by the UE according to the selected random access preamble.

Then, the new RA-RNTI generation method based on the DL channel/signal(such as synchronization signal block, broadcast) provided by thepresent disclosure.

Specifically, the base station may send broadcast messages andsynchronization signals via different DL transmission beams, whiletransmitted synchronization signal block or broadcast channel may bebound to a designated random access resource. One situation may be thatmultiple synchronization signal blocks may be bound to the same randomaccess time-frequency resource. As shown in FIG. 10 , thesynchronization signal block 1 and the synchronization signal block 2may be mapped to the same random access time-frequency resource.

Then, different preamble sets may need to be grouped so that the basestation may obtain the direction of the DL transmission beam preferredby the user via the detection of the random access message 1. Supposethat X=64 available random access preambles may be set for the DLtransmission beam 1 and DL transmission beam 2. The preamble set may bedivided into two groups. Wherein, the group 0 may include A (A<64)preambles that may be bound with the synchronization signal block 1 andthe group 1 may include B (B<64, A+B≤64) preambles that may be boundwith the synchronization signal block 2. When a preamble detected by thebase station on the corresponding random access resource belongs to thegroup 0, the base station may be implicitly notified of that the usertransmitting the preamble may prefer the synchronization signal block 1,i.e., the DL transmission beam 1. Similarly, when a preamble detected bythe base station on the corresponding random access resource belongs tothe group 1, the base station may be implicitly notified of that theuser transmitting the preamble may prefer the synchronization signalblock 2, i.e., the DL transmission beam 2.

It should be noted that the “corresponding random access resource” maybe that the random access resource, into which the one or multiple DLbeams may be mapped. In different random access resources, into whichthe same random access preamble may be mapped, the same random accesspreamble may belong to different preamble groups. As shown in FIG. 11 ,in the random access resources corresponding to the synchronizationsignal blocks 1 and 2, the preamble set may be divided into two groups.The preamble 32 may belong to a preamble group 1, while in the randomaccess resource corresponding to the synchronization signal block 3, thepreamble set may be divided into one group and the preamble 32 maybelong to a preamble group 0.

When the base station successfully detects a random access preamble, thebase station may need to transmit a RAR for the preamble and may need toperform a scrambling operation using the RA-RNTI when transmitting theRAR. For instance, the system may have made a configuration that oneradio frame may include 10 sub-frames, t_id may range from 0 to 9, thatis, (0≤t_id<10). The frequency domain of the random access resource mayhave 6 locations, f_id may range from 0 to 5, that is, (0≤f_id<6), theRA-RNTI may be calculated using an equation (2), i.e.,RA-RNTI=l+t_id+10*f_id+60*pg_id.

When the user detects that signal strength on the DL beam direction 2 ismax, the user may select the random access time-frequency resourcecorresponding to the synchronization signal block 2. The startinglocation of the random access time-frequency resource may be the secondsub-frame in time domain and the third PRB in the frequency domain andmay be transmitted using the preamble 32 selected from the preamblegroup 1 corresponding to the random access resource, that is, t_id=2,f_id=3, pg_id=1. Finally, the base station may successfully detect therandom access preamble 32 from the random access time-frequencyresource, the starting location of which may be the second sub-frame intime domain and the third frequency domain location in the frequencydomain, make a RAR for the preamble 32, and execute the scrambling usingthe RA-RNTI. Then, the value of the RA-RNTI may beRA-RNTI=1+2+10*3+60*1=93.

At the same time, the user may use a same generation mode to generatethe same RA-RNTI value. Therefore, the corresponding Physical DownlinkControl Channel (PDCCH) may be descrambled and possible RARs therein maybe searched.

It can be seen that in this embodiment, the random access resource maybe determined according to the physical broadcast signal andsynchronization signal block selected by the UE based on the DLmeasurement. The random access preamble transmitted by the UE may beselected from a preamble group, which may correspond to the randomaccess resource and may be bound with the physical broadcast signal orsynchronization signal block selected by the UE based on the DLmeasurement.

Embodiment Three

This embodiment may introduce a grouping mode of the preamble groups anda valuing mode of the preamble group index. By combining the groupingmode and group index valuing mode in this embodiment and the calculationmethod of the RA-RNTI in the above embodiment one and embodiment two,more choices may be provided for calculating the RA-RNTI.

In the foregoing embodiments, the different preamble sets may begrouped. In this embodiment, besides directly grouping the preamblesets, since the preamble set may be formed by different preamble rootsequence, or formed by the preamble sequence and different OrthogonalCover Codes (OCC)s, or formed by the preamble sequence and differentCyclic Shifts (CS)s. The grouping of the preambles may be performedbased on the preamble root sequence, OCC and CS. Therefore, the preamblegroup indexes may be different root sequence group indexes, OCC indexesor different CS indexes.

The base station may send broadcast messages and synchronization signalsvia different DL transmission beams, while different DL transmissionbeams may be bound to a designated random access resource. One situationmay be that multiple DL transmission beams may be bound to the samerandom access time-frequency resource. As shown in FIG. 8 , the DLtransmission beam 1 and the DL transmission beam 2 may be mapped intothe same random access time-frequency resource.

Then, different preamble sets may need to be grouped so that the basestation may obtain the direction of the DL transmission beam preferredby the user via the detection of the random access message 1. Thegrouping of the preamble may include any of the following fourscenarios:

1. The available random access preambles may be directly grouped.

For instance, suppose that with regard to the DL transmission beam 1 andthe DL transmission beam 2, there may be X=64 available random accesspreambles. The preamble set may be grouped into two groups. Group 0 mayinclude A (A<64) preambles, which may be bound with the DL transmissionbeam 1. Group 1 may include B (B<64, A+B≤64) preambles, which may bebound with the DL transmission beam 2. That is, when a preamble detectedby the base station on the corresponding random access resource belongsto the group 0, the base station may be implicitly notified of that theuser transmitting the preamble may prefer the DL transmission beam 1.Similarly, when a preamble detected by the base station on thecorresponding random access resource belongs to the group 1, the basestation may be implicitly notified of that the user transmitting thepreamble may prefer the DL transmission beam 2.

2. The available random access preambles may be grouped according toroot values of the preambles. Specifically, all preamble root sequencescorresponding to the available random access preambles may be grouped.When the available random access preambles are grouped, the randomaccess preambles generated by the preamble root sequences of the samegroup may be divided into one group. The index of the preamble group mayinclude a root sequence group index of a group, at which the preambleroot sequences used to generate the random access preambles may belocated. That is, in this mode, the preamble group may be determined bythe preamble root sequence group, to which the preamble root sequencesused by the available random access preambles may belong. The randomaccess preambles determined using the preamble root sequences of thesame group may belong to the same preamble group.

For instance, suppose that with regard to the DL transmission beam 1 andthe DL transmission beam 2, there may be X=64 available random accesspreambles and there may be X′=32 available preamble root sequences. Thepreamble set may be grouped into two groups based on the preamble rootsequences. Group 0 may include A′ (A′<32) preamble root sequences (atthe same time, the preambles generated based on the A′ root sequences inthe all 64 preambles), which may be bound with the DL transmissionbeam 1. Group 1 may include B′ (B′<32,A′±B′<32) preamble root sequences(at the same time, the preambles generated based on the B′ rootsequences in the all 64 preambles), which may be bound with the DLtransmission beam 2. That is, when a preamble detected by the basestation on the corresponding random access resource belongs to thepreamble root sequence group 0, the base station may be implicitlynotified of that the user transmitting the preamble may prefer the DLtransmission beam 1. Similarly, when a preamble detected by the basestation on the corresponding random access resource belongs to thepreamble root sequence group 1, the base station may be implicitlynotified of that the user transmitting the preamble may prefer the DLtransmission beam 2.

3. The available random access preambles may be grouped according toOCC. Specifically, each OCC corresponding to the available random accesspreambles may be grouped. When the available random access preambles aregrouped, the random access preambles generated using the OCCs of thesame group may be divided into a same group. The index of the preamblegroup may include an OCC group index of a group, at which the OCCs usedto generate the random access preambles may be located. That is, in thismode, the preamble group may be determined by the OCC group, to whichthe OCCs used by the available random access preambles may belong. Therandom access preambles determined using the OCCs of the same group maybelong to the same preamble group.

For instance, suppose that with regard to the DL transmission beam 1 andthe DL transmission beam 2, there may be X=64 available random accesspreambles and there may be X′=8 available OCCs. The preamble set may begrouped into two groups based on the OCCs. Group 0 may include A′ (A′<8)OCCs (at the same time, the preambles generated based on the A′ OCCs inthe all 64 preambles), which may be bound with the DL transmissionbeam 1. Group 1 may include B′ (B′<8, A′+B′≤8) OCCs (at the same time,the preambles generated based on the B′ OCCs in the all 64 preambles),which may be bound with the DL transmission beam 2. That is, when apreamble detected by the base station on the corresponding random accessresource belongs to the OCC group 0, the base station may be implicitlynotified of that the user transmitting the preamble may prefer the DLtransmission beam 1. Similarly, when a preamble detected by the basestation on the corresponding random access resource belongs to the OCCgroup 1, the base station may be implicitly notified of that the usertransmitting the preamble may prefer the DL transmission beam 2.

4. The available random access preambles may be grouped according toCyclic Shift (CS). Specifically, each CS value corresponding to theavailable random access preambles may be grouped. When the availablerandom access preambles are grouped, the random access preamblesgenerated using the cyclic shift values of the same group may be dividedinto a same group. The group index of the preamble group may include anindex of a group, at which the CS values used to generate the randomaccess preambles may be located. That is, in this mode, the preamblegroup may be determined by the CS group, to which the CS values used bythe available random access preambles may belong. The random accesspreambles determined using the CS values of the same group may belong tothe same preamble group.

For instance, suppose that with regard to the DL transmission beam 1 andthe DL transmission beam 2, there may be X=64 available random accesspreambles and X′=6 available CSs. The preamble set may be grouped intotwo groups based on the CSs. Group 0 may include A′ (A′<6) CSs (at thesame time, the preambles generated based on the A′ CSs in the all 64preambles) which may be bound with the DL transmission beam 1. Group 1may include B′ (B′<6, A′+B′≤6) CSs (at the same time, the preamblesgenerated based on the B′ CSs in the all 64 preambles) which may bebound with the DL transmission beam 2. That is, when a preamble detectedby the base station on the corresponding random access resource belongsto the CS group 0, the base station may be implicitly notified of thatthe user transmitting the preamble may prefer the DL transmissionbeam 1. Similarly, when a preamble detected by the base station on thecorresponding random access resource belongs to the CS group 1, the basestation may be implicitly notified of that the user transmitting thepreamble may prefer the DL transmission beam 2.

It should be noted that the “corresponding random access resource” maybe that the random access resource, into which the one or multiple DLbeams may be mapped. In different random access resources, into whichthe same random access preamble may be mapped, the same random accesspreamble may belong to different preamble groups. As shown in FIG. 8 ,in the random access resources corresponding to the DL transmissionbeams 1 and 2, the preamble set may be divided into two groups. Thepreamble 32 may belong to a preamble group 1, while in the random accessresource corresponding to the DL transmission beam 3, the preamble setmay be divided into one group and the preamble 32 may belong to apreamble group 0.

When the base station successfully detects a random access preamble, thebase station may need to transmit a RAR for the preamble and may need toperform a scrambling operation using the RA-RNTI when transmitting theRAR. For instance, the system may have made a configuration that oneradio frame may include 10 sub-frames, t_id may identify a sub-frameindex and may range from 0 to 9, that is, (0<t_id<10). The frequencydomain of the random access resource may have 6 PRBs, f_id may identifya PRB index and may range from 0 to 5, that is, (0<f_id<6), the RA-RNTImay be calculated using the equation (2), i.e.,RA-RNTI=l+t_id+10*f_id+60*pg_id.

When the user detects that signal strength on the DL beam 2 is max (thatis, Reference Signal Receiving Power (RSRP) measured on the DLtransmission beam 2 may be max), the user may select the random accesstime-frequency resource corresponding to the DL beam 2. The startinglocation of the random access time-frequency resource may be the secondsub-frame in time domain and the third PRB in the frequency domain andmay be transmitted using the preamble 32 selected from the preamblegroup 1, that is, t_id=2, f_id=3, pg_id=1. Finally, the base station maysuccessfully detect the random access preamble 32 from the random accesstime-frequency resource, the starting location of which may be thesecond sub-frame in time domain and the third frequency domain locationin the frequency domain, make a RAR to the preamble 32, and execute thescrambling using the RA-RNTI. Then, the value of the RA-RNTI may beRA-RNTI=1+2+10*3+60*1=93.

At the same time, the user may use a same generation mode to generatethe same RA-RNTI value. Therefore, the corresponding Physical DownlinkControl Channel (PDCCH) may be descrambled and possible RARs therein maybe searched.

Embodiment Four

In the communication system, there may be no frequency-domain'sdifference between random access resources, which may be selected by theuser. With regard to this kind of random access resource, a method forgenerating the RA-RNTI may be provided in this embodiment.

The base station may send broadcast messages and synchronization signalsvia different DL transmission beams, while different DL transmissionbeams may be bound to designated random access resources. One situationmay be that multiple DL transmission beams may be bound to the samerandom access time-frequency resource. As shown in FIG. 12 , the DLtransmission beam 1 and the DL transmission beam 2 may be mapped to thesame random access time-frequency resource. Meanwhile, a specialsituation may be that when the system is configured with no randomaccess resource of different moments, that is, the random accesstime-frequency resources corresponding to the DL transmission beam mayonly differ on the frequency domain.

Then, different preamble sets may need to be grouped so that the basestation may obtain the direction of the DL transmission beam selected bythe user via the detection of the random access message 1. Suppose thatX=64 available random access preambles may be set for the Dltransmission beam 1 and DL transmission beam 2. The preamble set may bedivided into two groups. Wherein, the group 0 may include A (A<64)preambles that may be bound with the DL transmission beam direction 1and the group 1 may include B (B<64, A+B≤64) preambles that may be boundwith the DL transmission beam direction 2. When a preamble detected bythe base station on the corresponding random access resource belongs tothe group 0, the base station may be implicitly notified of that theuser transmitting the preamble may prefer the DL transmission beam 1.Similarly, when a preamble detected by the base station on thecorresponding random access resource belongs to the group 1, the basestation may be implicitly notified of that the user transmitting thepreamble may prefer the DL transmission beam 2.

It should be noted that the “corresponding random access resource” maybe that the random access resource, into which the one or multiple DLbeams may be mapped. In different random access resources, into whichthe same random access preamble may be mapped, the same random accesspreamble may belong to different preamble groups. As shown in FIG. 13 ,in the random access resources corresponding to the DL transmissionbeams 1 and 2, the preamble set may be divided into two groups. Thepreamble 32 may belong to a preamble group 1, while in the random accessresource corresponding to the DL transmission beam 3, the preamble setmay be divided into one group and the preamble 32 may belong to apreamble group 0.

When the base station successfully detects a random access preamble, thebase station may need to transmit a RAR for the random access preambleand may need to perform a scrambling operation using the RA-RNTI whentransmitting the RAR. For instance, since the time locations (sub-frameindex number) of the random access resources of the system are the same,different time locations may be used to calculate the RA-RNTI, that is,in the calculation provided by the above equation (1), t_id may beconfigured as 0. For instance, suppose that the frequency domain of theset random access resource of the system may have 6 PRBs, f_id may rangefrom 0 to 5, that is, (0<f_id<6), the RA-RNTI may be calculated usingthe above equation, i.e., RA-RNTI=1+f_id+6*pg_id.

RA-RNTI=1+3+6*1=10.

When the user detects that signal strength on the DL transmission beam 2is max (that is, Reference Signal Receiving Power (RSRP) measured on theDL transmission beam 2 may be max), the user may select the randomaccess time-frequency resource corresponding to the DL beam 2. Thestarting location of the random access time-frequency resource may bethe third PRB in the frequency and may be transmitted using the preamble32 selected from the preamble group 1, that is, f_id=3, pg_id=1.Finally, the base station may successfully detect the random accesspreamble 32 from the random access time-frequency resource, the startinglocation of which may be the third frequency domain location in thefrequency domain, make a RAR to the preamble 32, and execute thescrambling using the RA-RNTI. Then, the value of the RA-RNTI may beRA-RNTI=1+3+6*1=10.

At the same time, the user may use a same generation mode to generatethe same RA-RNTI value. Therefore, the corresponding Physical DownlinkControl Channel (PDCCH) may be descrambled and possible RARs therein maybe searched.

The grouping of the preambles and the indexing of the preambles in thisembodiment may use that in the embodiment three. What are bound with thepreamble groups may be the physical broadcast signals or synchronizationsignal blocks.

Embodiment Five

In the communication system, there may have time-domain's differences,but no frequency-domain's difference between different random accessresources, which may be selected by the user. With regard to this kindof random access resource, a method for generating the RA-RNTI may beprovided in this embodiment.

The base station may send broadcast messages and synchronization signalsvia different DL transmission beams, while different DL transmissionbeams may be bound to designated random access resources. One situationmay be that multiple DL transmission beams may be bound to the samerandom access time-frequency resource. As shown in FIG. 14 , the DLtransmission beam 1 and the DL transmission beam 2 may be mapped to thesame random access time-frequency resource. Meanwhile, a specialsituation may be that when the system is configured with no randomaccess resource of different frequency domain locations, that is, therandom access time-frequency resources corresponding to the DLtransmission beam may only differ on the time domain.

Then, different preamble sets may need to be grouped so that the basestation may obtain the direction of the DL transmission beam selected bythe user via the detection of the random access message 1. Suppose thatX=64 available random access preambles may be set for the DLtransmission beam 1 and DL transmission beam 2. The preamble set may bedivided into two groups. Wherein, the group 0 may include A (A<64)preambles that may be bound with the DL transmission beam direction 1and the group 1 may include B (B<64, A+B≤64) preambles that may be boundwith the DL transmission beam direction 2. When a preamble detected bythe base station on the corresponding random access resource belongs tothe group 0, the base station may be implicitly notified of that theuser transmitting the preamble may prefer the DL transmission beam 1.Similarly, when a preamble detected by the base station on thecorresponding random access resource belongs to the group 1, the basestation may be implicitly notified of that the user transmitting thepreamble may prefer the DL transmission beam 2.

It should be noted that the “corresponding random access resource” maybe that the random access resource, into which the one or multiple DLbeams may be mapped. In different random access resources, into whichthe same random access preamble may be mapped, the same random accesspreamble may belong to different preamble groups. As shown in FIG. 15 ,in the random access resources corresponding to the DL transmissionbeams 1 and 2, the preamble set may be divided into two groups. Thepreamble 32 may belong to a preamble group 1, while in the random accessresource corresponding to the DL transmission beam 3, the preamble setmay be divided into one group and the preamble 32 may belong to apreamble group 0.

When the base station successfully detects a random access preamble, thebase station may need to transmit a RAR for the preamble and may need toperform a scrambling operation using the RA-RNTI when transmitting theRAR. For instance, since the frequency domain locations (frequencydomain index number) of the random access resource of the system are thesame, different frequency domain locations may be used to calculate theRA-RNTI, that is, in the calculation provided by the above equation (1),f_id may be configured as 0. For instance, suppose that theconfiguration of the system may be that one radio frame may have 10sub-frames, t_id may range from 0 to 9, that is, (0<t_id<10), theRA-RNTI may be calculated using the above equation, i.e.,RA-RNTI=1+t_id+10*pg_id.

When the user detects that signal strength on the DL transmission beam 2is max (that is, Reference Signal Receiving Power (RSRP) measured on theDL transmission beam 2 may be max), the user may select the randomaccess time-frequency resource corresponding to the DL beam 2. Thestarting location of the random access time-frequency resource may bethe fifth sub-frame in the time domain and may be transmitted using thepreamble 32 selected from the preamble group 1, that is, t_id=5,pg_id=1. Finally, the base station may successfully detect the randomaccess preamble 32 from the random access time-frequency resource, thestarting location of which may be the fifth sub-frame in the timedomain, make a RAR to the preamble 32, and execute the scrambling usingthe RA-RNTI. Then, the value of the RA-RNTI may be RA-RNTI=1+5+10*1=16.

At the same time, the user may use a same generation mode to generatethe same RA-RNTI value. Therefore, the corresponding Physical DownlinkControl Channel (PDCCH) may be descrambled and possible RARs therein maybe searched.

The grouping of the preambles and the indexing of the preambles in thisembodiment may use that in the embodiment three. What are bound with thepreamble groups may be the physical broadcast signals or synchronizationsignal blocks.

Embodiment Six

This embodiment may introduce a new method for generating the RA-RNTIbased on the preamble index provided by the present disclosure via aspecific flow. Specifically, in this embodiment, the preamble index maybe taken as the preamble group index. In an alternative, it may beconsidered that when grouping the preambles, each available randomaccess preamble may be grouped as one preamble group. In this situation,when the preamble group is bound with the DL transmission beam, onepreamble group may be bound with one DL transmission beam or onepreamble group may be bound with multiple DL transmission beams.

The base station may send broadcast messages and synchronization signalsvia different DL transmission beams, while different DL transmissionbeams may be bound to designated random access resources. One situationmay be that multiple DL transmission beams may be bound to the samerandom access time-frequency resource. As shown in FIG. 7 , the DLtransmission beam 1 and the DL transmission beam 2 may be mapped to thesame random access time-frequency resource.

Then, different preamble sets may need to be grouped so that the basestation may obtain the direction of the DL transmission beam selected bythe user via the detection of the random access message 1. Suppose thatX=64 available random access preambles may be set for the Dltransmission beam 1 and DL transmission beam 2. The preamble set may bedivided into two groups. Wherein, the group 0 may include A (A<64)preambles that may be bound with the DL transmission beam direction 1and the group 1 may include B (B<64, A+B≤64) preambles that may be boundwith the DL transmission beam direction 2. When a preamble detected bythe base station on the corresponding random access resource belongs tothe group 0, the base station may be implicitly notified of that theuser transmitting the preamble may prefer the DL transmission beam 1.Similarly, when a preamble detected by the base station on thecorresponding random access resource belongs to the group 1, the basestation may be implicitly notified of that the user transmitting thepreamble may prefer the DL transmission beam 2.

It should be noted that the “corresponding random access resource” maybe that the random access resource, into which the one or multiple DLbeams may be mapped. In different random access resources, into whichthe same random access preamble may be mapped, the same random accesspreamble may belong to different preamble groups. As shown in FIG. 7 ,in the random access resources corresponding to the DL transmissionbeams 1 and 2, the preamble set may be divided into two groups. Thepreamble 32 may belong to a preamble group 1, while in the random accessresource corresponding to the DL transmission beam 3, the preamble setmay be divided into one group and the preamble 32 may belong to apreamble group 0.

When the base station successfully detects a random access preamble, thebase station may need to transmit a RAR for the preamble and may need toperform a scrambling operation using the RA-RNTI when transmitting theRAR. For instance, the system may have made a configuration that oneradio frame may include 10 sub-frames, t_id may identify a sub-frameindex and may range from 0 to 9, that is, (0<t_id<10). The frequencydomain of the random access resource may have 6 PRBs, f_id may identifya PRB index and may range from 0 to 5, that is, (0<f_id<6). Thecalculation mode of the RA-RNTI may directly use the index of thepreambles and this situation may be a special embodiment of the preamblegrouping. That is, the total 64 preambles may be grouped into 64 groups,the 0th to 31th groups may indicate the DL transmission beam 1 (that is,the 0th to 31th groups may be bound with the DL transmission beam 1),the 32th to 63th groups may indicate the DL transmission beam 2 (thatis, 32th to 63th groups may be bound with the DL transmission beam 2).Therefore, pg_id=preamble index, the calculation of RA-RNTI may beperformed using equation (2), that is,RA-RNTI=1+t_id+10*f_id+60*preamble_id.

When the user detects that signal strength on the DL beam 2 is max (thatis, Reference Signal Receiving Power (RSRP) measured on the DLtransmission beam 2 may be max), the user may select the random accesstime-frequency resource corresponding to the DL beam 2. The startinglocation of the random access time-frequency resource may be the secondsub-frame in the time domain and the third PRB in the frequency domainand may be transmitted using the preamble 32 selected from the preamblegroup, that is, t_id=2, f_id=3, preamble_id=32. Finally, the basestation may successfully detect the random access preamble 32 from therandom access time-frequency resource, the starting location of whichmay be the second sub-frame in the time domain and the third frequencydomain location in the frequency domain, make a RAR for the preamble 32,and execute the scrambling using the RA-RNTI. Then, the value of theRA-RNTI may be RA-RNTI=1+2+10*3+60*32=1952.

At the same time, the user may use a same generation mode to generatethe same RA-RNTI value. Therefore, the corresponding Physical DownlinkControl Channel (PDCCH) may be descrambled and possible RARs therein maybe searched.

The grouping of the preambles and the indexing of the preambles in thisembodiment may use that in the embodiment three. What are bound with thepreamble groups may be the physical broadcast signals or synchronizationsignal blocks.

Embodiment Seven

The specific processing for generating the RA-RNTI using the method ofthe present disclosure in the EMTC system may be described in thisembodiment.

When the user reads the configuration information of the random accessvia the DL channel, after obtaining the random access time frequencyresources and the corresponding random access preamble (i.e., the randomaccess preamble sequence) group, the random access preambles may betransmitted on the selected random access time frequency resources.After a period after the preambles are transmitted, the user may searcha possible RAR according to length of a RAR window and the RAR may beindicated by the RA-RNTI. Different from the traditional calculationmode in the EMTC system, the calculation mode of the RA-RNTI provided byembodiments of the present disclosure may be associated with a timefrequency resource location of a given Physical Random Access Channel(PRACH), an index (such as the index SFN_id of the first radio frame(index of the first radio frame of the given PRACH)) of a firstfirst-time-unit, at which the PRACH may be located, and group indexes ofavailable random access preamble groups on the PRACH.

The resource location of the PRACH may include an index (such as, thefirst radio frame index) of a first first-time-unit, at which the PRACHused by the transmitted random access preamble may be located, indexinformation t_id (such as the sub-frame index) of a second time unit inthe first time unit (such as radio frame), at which the PRACH may belocated, and index information f_id of a starting frequency unit. Thesecond time unit t_id in this embodiment may be the same as the t_id inthe above embodiment, that is, t_id may be the index of the time unit ormay be the combination of multiple different time unit indexes. Forinstance, when the t_id identifies the sub-frame, t_id may range from 0to M, that is 0<t_id<M+1. Wherein, f_id may be same as that in the aboveembodiment, such as, when the f_id identifies a Physical Resource Block(PRB) index of a PRB, f_id may range from 0 to N, and (0<f_id<N+1). Mand N may be nonnegative integers.

The group index of the random access preamble group may include pg_id ofa random access preamble group, to which the transmitted random accesspreamble may belong. The random access preamble group may be only forrandom access time-frequency resources selected by the user and pg_idmay range from 0 to P, (0≤pg_id<P+1), P is a nonnegative integer. Itshould be noted that since the preamble group may be used to notify thebase station of the DL transmission beam selected by the user, thepreamble group may be bound with the DL transmission beam. When theRA-RNTI is calculated, the preamble group index may be an index of a DLTransmission beam, or an index of a Synchronization Signal (SS) block,or an index of a Physical Broadcast Channel (PBCH). Further, besidesdirectly grouping the preamble set, since the preamble set may be formedby different preamble root sequence groups, or formed by the preamblesequence and different Orthogonal Cover Codes (OCC)s, or formed by thepreamble sequence and different Cyclic Shifts (CS)s. Therefore, thepreamble group indexes may be different root sequence group indexes, OCCindexes or different CS indexes.

The calculation mode of the RA-RNTI may include:

RA-RNTI=1+a*t_id+b*f_id+c*(SFN_id mod(Wmax/10))+d*pg_id.

Wherein, a, b, c, d may respectively be coefficients of t_id, f_id,(SFN_id mod(Wmax/10)) and pg_id. Values of a, b, c and d should satisfya condition, that is, the RA-RNTI should only correspond to the value of{t_id, f_id, (SFN_id mod(Wmax/10)), pg_id}. The only value of theRA-RNTI may be calculated from the value of a group of {t_id, f_id,

$\left( {{SFN}_{id}{{mod}\left( \frac{W\max}{10} \right)}} \right),$

pg_id}. On the contrary, the only value of {t_id, f_id, (SFN_idmod(Wmax/10)), pg_id} may be calculated from the value of the RA-RNTI. Afeasible scheme may be that the value of a may be 1, the value of b maybe the maximum value of (1+a*t_id), the value of c may be the maximumvalue of (1+a*t_id+b*f_id), the value of d may be the maximum value of(1+a*t_id+b*f_id+c*(SFN_id mod(Wmax/10))). Wmax may be the length of themaximum possible RAR window of the user, such as, Wmax=400, (SFN_idmod(Wmax/10)) may range from 0 to 39. That is,

a=1,

b=max{1+a*t_id}=M+1,

c=max{l+a*t_id+b*f_id}=(M+1)(N+1),

d=max{1+a*t_id+b*f_id+c*(SFN_id mod(Wmax/10))}=(M+1)(N+1)*(Wmax/10)

For instance, M=9, N=5, Wmax=400; the calculation mode of the RA-RNTImay be:

RA-RNTI=1+t_id+10*f_id+60*(SFN_id mod(40))+2400*pg_id.

Embodiment Eight

The specific processing for generating the RA-RNTI using the method ofthe present disclosure in the Narrow Band Internet of Things (NB-IOT)system may be described in this embodiment.

When the user reads the configuration information of the random accessvia the DL channel, after obtaining the random access time frequencyresources and the corresponding random access preamble (i.e., the randomaccess preamble sequence) group, the random access preambles may betransmitted on the selected random access time frequency resources.After a period after the preambles are transmitted, the user may searcha possible RAR according to length of a RAR window and the RAR may beindicated by the RA-RNTI. Different from the traditional calculationmode in the NB-IOT system, the calculation mode of the RA-RNTI providedby embodiments of the present disclosure may be associated with an index(such as the index SFN_id of the first radio frame (index of the firstradio frame of the given PRACH)) of a first first-time-unit, at which agiven PRACH may be located, and group indexes of available random accesspreamble groups on the PRACH.

The index of the random access preamble group may include pg_id of arandom access preamble group, to which the transmitted random accesspreamble may belong. The random access preamble group may be only forrandom access time-frequency resources selected by the user and pg_idmay range from 0 to P, (0≤pg_id<P+1), P is a nonnegative integer. Itshould be noted that since the preamble group may be used to notify thebase station of the DL transmission beam selected by the user, thepreamble group may be bound with the DL transmission beam. When theRA-RNTI is calculated, the preamble group index may be an index of a DLTransmission beam, or an index of a Synchronization Signal (SS) block,or an index of a Physical Broadcast Channel (PBCH). Further, besidesdirectly grouping the preamble set, since the preamble set may be formedby different preamble root sequence groups, or formed by the preamblesequence and different Orthogonal Cover Codes (OCC)s, or formed by thepreamble sequence and different Cyclic Shifts (CS)s. Therefore, thepreamble group indexes may be different root sequence group indexes, OCCindexes or different CS indexes.

The calculation method of the RA-RNTI may include:

RA-RNTI=1+a*floor(SFN_id/4)+b*pg_id

The value of floor(x) may be the largest integer, a and b mayrespectively be coefficients of floor(SFN_id/4) and pg_id, values of aand b should satisfy a condition, that is, the value of RA-RNTI shouldonly correspond to that of the {floor(SFN_id/4), pg_id}. The only valueof RA-RNTI may be calculated from the value of a group of{floor(SFN_id/4), pg_id}. On the contrary, the only value of the{floor(SFN_id/4), pg_id} may be calculated from the value of theRA-RNTI. A feasible scheme may be that the value of a may be 1, thevalue of b may be the maximum value of (1+a*floor(SFN_id/4)).

a=1,

b=max{1+a*floor(SFN_id/4)}=floor(SFN_id/4)+1,

For instance, SEN1024; the calculation method of the RA-RNTI mayinclude:

RA-RNTI=1+floor(SFN_id/4)+257*pg_id.

Embodiment Nine

In the above embodiment, the calculation method of the RA-RNTI inembodiments of the present disclosure may be described by setting thet_id as the sub-frame index and setting the f_id as the PRB index. Inthis embodiment, the setting of extending t_id may be determinedaccording to multiple time unit indexes, such as determined according tomultiple of a sub-frame index, slot index, mini-slot index, symbol-groupindex and symbol index. The setting of extending f_id may be determinedaccording to multiple frequency unit indexes, such as multiple of aPRB-group index, a PRB index, a subcarrier index and a subcarrier groupindex.

For instance, when the t_id represents index information of a timeslot,the index information may be a timeslot index value, or the indexinformation may be determined according to the timeslot index andsub-frame index. When the index information is determined according tothe timeslot index and sub-frame index, the sub-frame index t_sf rangesfrom 0 to M_1, and a timeslot index t_slot in a sub-frame ranges from 0to M_2, the value oft id may be t_id=t_slot+(1+M_2)*t_sf and may rangefrom 0 to M_1+(1+M_1)*M_2. In corresponding other embodiments, themaximum value oft id may be M=M_1+(1+M_1)*M_2. Preferably, there may bea one-to-one corresponding relationship between the value of t_id andthe value of {t_sf,t_slot}. That is, the only value of {t_sf,t_slot} maybe calculated from one t_id, vice versa. For instance, when M_1=9,M_2=1, t_id=t_slot+2*t_sf. For instance, when the value of t_id is 28,it may be calculated that t_slot=0,t_sf=14. When index combination ofother time unit indexes is adopted, the setting of the t_id may besimilarly calculated. Suppose that the t_id is formed by a (t_1) index,a (t_2) index, a (t_X) index, and value scopes thereof may respectivelybe 0-M_1, 0-M_2 . . . 0-M X, the setting of t_id may be t_id=a1*t 1+a2*t2+ . . . +ax*t_X.

wherein,

-   -   a1=1;    -   a2=l+max{t_1}=1+M_1;    -   a3=l+max{t_1+a2*t_2}=(1+M_1)(1+M_2);    -   . . .    -   ax=1+max(t_1+a2*t_2+ . . . +(ax−1)*t_(X−1)).

Similarly, for instance, when the f_id represents the index informationof the PRB and the index information may be the subcarrier index. In analternative, the f_id may be determined according to the subcarrierindex and PRB index f_prb. When the f_id is determined according to thesubcarrier index and the PRB index, the ranging scope of the PRB indexmay be 0 to N_1. While the ranging scope of the subcarrier index in onePRB may be 0 to N_2, the value of f_id may be f|id=f_sc+(1+N_2)*f_prband the ranging scope of f_id may be o to N_1+(1+N_1)*N_2. In othercorresponding embodiments, the maximum value of f_id may beN=N_1+(1+N_1)*N_2. Preferably, there may be a one-to-one correspondingrelationship between the value of f_id and the value of {f_sc,f_prb}.That is, the only value of {f_sc,f_prb} may be calculated from one t_id,vice versa. For instance, when N_1=5, N_2=11, f_id=f_sc+12*f_prb. Forinstance, when the value of f_id is 42, it may be calculated thatf_sc=6,f_prb=3. When index combination of other frequency unit indexesis adopted, the setting of the f_id may be similarly calculated. Supposethat the f_id is formed by a (f_1) index, a (f_2) index, a (f_Y) index,and value scopes thereof may respectively be 0-N_1, 0-N_2 . . . 0-N_Y,the setting of f_id may be f_id=b1*f_1+b2*f_2+ . . . +by*f_Y.

-   -   wherein    -   b1=1;    -   b2=1+max{f_1}=1+N_1;    -   b3=1+max{f 1+b2*f_2}=(1+N_1)(1+N_2);    -   . . .    -   by=1+max(f 1+b2*f 2+ . . . +(by−1)*f_(Y−1)).

The above may be specific implementation of the information generationmethods in the present disclosure. Embodiments of the present disclosuremay further provide a UE for generating the information and a basestation for generating the information, which may be used to implementthe information generation method. FIG. 16 is a schematic diagramillustrating structure of the UE for generating the information. Asshown in FIG. 16 , the device may include: a transmitting unit and acalculating unit.

The transmitting unit may be to send a random access preamble to a basestation. The calculating unit may be to calculate a Random Access-RadioNetwork Temporary Identifier (RA-RNTI) according to an index of apreamble group, to which the transmitted random access preamble belongs,and a resource location of a random access resource bearing the randomaccess preamble; wherein the preamble group may be a group of availablerandom access preambles corresponding to the random access resource.

FIG. 17 is a schematic diagram illustrating structure of a base stationfor generating information. As shown in FIG. 17 , the device mayinclude: a receiving unit and a calculating unit.

The receiving unit may be to receive a random access preamble from aUser Equipment (UE). The calculating unit may be to calculate a RandomAccess-Radio Network Temporary Identifier (RA-RNTI) according to anindex of a preamble group, to which the received random access preamblebelongs, and a resource location of a random access resource bearing therandom access preamble. The preamble group may be a group of availablerandom access preambles corresponding to the random access resource.

It can be seen from the above that in the information generation methodand device provided by embodiments of the present disclosure, theRA-RNTI may be calculated and generated using time-frequency resourcelocations used by the random access and an index of a group, at whichthe selected preamble may be located. Therefore, when the user searchesthe possible RARs, RARs that use the same time-frequency resource andbelong to different preamble groups may be automatically excluded viathe generated RA-RNTI to save users' search overhead and delay. Whilethe base station may distinguish and select users of different DLtransmission beams using different RA-RNTIs in the RAR via the detectedrandom access preambles. Meanwhile, the generation method may be appliedto the eMTC and NBIot systems.

Embodiment Ten

In this embodiment, a random access method for a UE will be described.Specifically, a method for reporting a number of beams that the UE hasby the UE in a random access procedure will be introduced in combinationwith a specific system. In this embodiment, in the random accessprocedure, a Message 3 carries information on the number of the beamsthat the UE has. Specific procedure of the random access method of theUE is as follows.

Step 0: The UE obtains a random access configuration information,including a random access channel configuration and a preamble sequenceresource pool information, in a System Information Block (SIB).

Step 1: The UE determines a random access channel and a preamblesequence according to the random access channel configuration and thepreamble sequence resource pool information, and transmits the preamblesequence on the random access channel. The preamble sequence is randomlyselected from a preamble sequence resource pool configured by the basestation in an equal probability.

Step 2: After transmitting the preamble sequence, the UE detects arandom access response in a random access response window. If the randomaccess response is successfully detected and a preamble sequenceidentifier matching the transmitted preamble sequence is detected in therandom access response, it is considered that the random access responseis successfully detected, and information on an uplink grant, a timingadvance, a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI),etc, for the Message 3 are obtained from the random access response. Ifthe random access response is not successfully detected in the randomaccess response window or the preamble sequence identifier detected inthe random access response does not match the transmitted preamblesequence, it is considered that this random access is not successful,the random access attempt is repeated after a power or transmittingbeams are adjusted.

Step 3: If the random access response is successfully detected and thepreamble sequence identifier matching the transmitted preamble sequenceis detected in the random access response, the UE transmits the Message3 on a time-frequency resource specified by the uplink grant. Whereinthe message 3 includes an unique identifier of the UE and an indicationof the number of beams that the UE has.

Step 4: After transmitting the Message 3, the UE detects contentionresolution information. If the unique identifier of the UE included inthe contention resolution information matches the unique identifier ofthe UE, the contention resolution of the UE is successful and the randomaccess succeeds. If the Message 3 fails to be sent or the uniqueidentifier of the UE included in the contention resolution informationdoes not match the unique identifier of the UE, the contentionresolution of the UE is failed, and the random access is reattemptedafter the power or the transmitting beams is adjusted.

In an embodiment, if the contention resolution succeeds, the UE detectsuser-specific CSI-RSs or SRSs information configured by the basestation, and receives the configured CSI-RSs or SRSs. The CSI-RSs orSRSs are configured for the UE by the base station according to anindication of the number of beams reported by the UE.

Correspondingly, behaviors at the base station side can be described asfollows.

Step 0: The base station transmits the random access configurationinformation, which includes the random access channel configuration andthe preamble sequence resource pool information, in the systeminformation block (SIB).

Step 1: The base station detects the transmission of the preamblesequence on the configured random access channel.

Step 2: If the base station detects the transmission of the preamblesequence, the base station determines various parameters in the randomaccess response according to the detected preamble sequence, informationon delay of the detected preamble sequence, and etc., and transmits therandom access response on a downlink shared channel at a fixed orconfigured timing after detecting the random access channel of thepreamble sequence.

Step 3: After transmitting the random access response, the base stationdetects the Message 3 on an uplink shared channel indicated by theresource allocation information in the uplink grant allocated in therandom access response, and obtains the number of beams that the UE hasin the Message 3.

Step 4: The base station transmits the contention resolution informationaccording to a competition result.

The above process may be described using FIG. 18 . FIG. 18 shows aprocess of an interaction between a base station and a UE in theembodiment 1.

In another embodiment, in the above step 4, the base station may includethe contention resolution information together with the CSI-RSs or SRSsconfigured for the UE in a Message 4 and transmit the Message 4 to theUE. Specifically, the base station configures the UE with the CSI-RSs orSRSs corresponding to the beam-numbers of the UE, according to thebeam-numbers of the UE detected in the Message 3. FIG. 32 is an examplediagram illustrating CSI-RSs configured by the base station according tothe reported beam-numbers. As shown in FIG. 32 , if the number of beamsreported by the UE in Message 3 is 4, the base station configures 4CSI-RSs or SRSs corresponding to the beam-numbers 4 of UE for the UE,wherein the number of the CSI-RSs or SRSs indicates a number of timesthat the same CSI-RS or SRS is repeatedly transmitted on time-frequencyresources. Wherein,

1. The base station may use different beams to transmit the configuredCSI-RSs for a downlink beam management or correction; or

2. The base station may use the same beam to transmit the configuredCSI-RS for an uplink beam management or correction.

In still another embodiment, the base station may further notify theCSI-RSs or SRSs configured for the UE through the downlink channel (adownlink control channel or a downlink shared channel) for theuplink/downlink beam management or correction, after the random accessis completed, The number of the CSI-RSs or SRSs configured by the basestation is determined according to the beam-number of the UE reported bythe UE in Message 3.

In the above random access procedure, an indication of the beam-numberof the UE is added in the Message 3. The indication of the beam-numberis used to inform the base station of the number of the beams that theUE has. A possible manner is that the indication of the beam-number isindicated by N (N>0) bit indication information, for example, if N=4,the UE may notify the base station of possible 0 to 15 beams that the UE(for example, the UE) has by reporting 16 values of 0000 to 1111. Theindication of the beam-number is determined according to a maximumnumber of the beams that the UE has or a maximum number of the beamswhich can be processed by the base station. For example, a particulartype of the UE has very a very strong beam capability and has 128 beams,but the maximum number of the beams which can be processed by the basestation is 32, then the number of bits indicated in a preset indicationof the beam-number is 5. A possible indication manner is as shown inTable 1, assuming that N=3, that is, the indication of the beam-numberhas 3 bits:

TABLE 1 Exemplary Beam Number Capability Indication (beginning from 0)Bit Meaning of Value Indication (Number of Beams) 000 0 001 1 010 2 0113 100 4 101 5 110 6 111 7

In another case, by default, a user has a capability of at least onebeam, and another meaning of the values of the exemplary table of theindication of the beam-number may be 1 to 2N beams, that is, if N=3,there are 1 to 8 beams, as shown in Table 2.

TABLE 2 Exemplary Beam Number Capability Indication (beginning from 1)Bit Meaning of Value Indication (Number of Beam) 000 1 001 2 010 3 011 4100 5 101 6 110 7 111 8

The configuration (number of bits) of the indication of the beam-numbermay be:

-   -   1. a preset fixed value;    -   2. notified through a downlink control channel;    -   3. notified through a downlink shared channel;    -   4. notified through a broadcast channel; or    -   5. carried in the random access configuration information in the        system information and notified to the UE.

The foregoing Message 3 carries the beam number indication in thefollowing manners.

Manner 1: In the Message 3, a new field is directly added fortransmitting the indication of the beam-number. That is, when the randomaccess procedure is used for an initial access, the Message 3 includesat least the beam number indication, an RRC connection request, etc. Inthis manner, a structure of the Message 3 transmitted on the uplinkshared channel is shown in FIG. 19 , and FIG. 19 is the structure of theMessage 3 adopting the manner 1.

It should be noted that, the structure shown in FIG. 19 is only anexample, and actual positions of respective field may change.

Manner 2: A new field is added to the RRC connection request in theMessage 3 to notify the beam-number capability of the UE. The existingRRC connection requests include: a UE identity information(ue-Identity), an establishment cause information (establishmentCause),and reserved fields. The UE identity information is selected from twovalues: a s-TMSI of the UE or a random value. The establishment causeinformation includes: emergency, high priority access(highPriorityAccess), mobile UE access (mt-Access), mobile originatingsignaling (mo-signaling), mobile originating data (mo-data), delaytolerant access (delayTolerantAccess-v1020), mobile originating voicecommunication (mo-VoiceCall-v1280), etc.

Based on these fields, the indication of the beam-number is added. Forexample, one possible parameter for the indication of the beam-number isue-beamNum, represented by BIT STRING of N bits.

In the foregoing manner, the RRC connection request is written asfollows, where the value of N is the number of bits of the indication ofthe beam-number:

RRCConnectionRequest ::= SEQUENCE {  ue-Identity   InitialUE-Identity, establishmentCause   EstablishmentCause,  ue-beamNum   BIT STRING (SIZE(N))  spare   BIT STRING (SIZE (1)) } InitialUE-Identity ::=  CHOICE { s-TMSI   S-TMSI,  randomValue   BIT STRING (SIZE (40)) }EstablishmentCause ::=  ENUMERATED {   emergency, highPriorityAccess,mt-Access, mo-Signalling,   mo-Data, delayTolerantAccess-v1020,mo-Voicecall-v1290, spare1)

This embodiment provides an apparatus for random access of a UE, whereinthe apparatus explicitly notifies abeam-number of a UE by using aMessage 3, and the apparatus comprises the following modules:

-   -   a configuration information obtaining module for obtaining        random access configuration information carried in a main        information block in a broadcast channel or a system information        block indicated by the main information block;    -   a preamble sequence transmitting module for determining a random        access channel and a preamble sequence according to the random        access configuration information, and transmitting the preamble        sequence on the random access channel;    -   a random access response detection module for detecting a random        access response transmitted by a base station;    -   a Message 3 generating and transmitting module for generating        and transmitting a Message 3 according to the detected random        access response and an indication of the number of beams that        the UE has, wherein the Message 3 includes the indication of the        number of the beams that the UE has; and    -   a contention resolution receiving module for receiving        contention resolution information and completing a random access        procedure.

In addition, the contention resolution receiving module may furtherreceive CSI-RS or SRS signals configured by the base station. The numberof the CSI-RS or SRS signals configured by the base station isdetermined according to the number of the beams that the UE has, whichis reported by the UE in the Message 3.

Wherein the preamble sequence transmitting module determines the randomaccess channel and the preamble sequence according to the random accesschannel configuration and the preamble sequence resource poolinformation, and transmits the preamble sequence on the random accesschannel.

Wherein the transmitted preamble sequence is randomly selected at anequal probability by the preamble sequence transmitting module from thepreamble sequence resource pools configured by the base station.

Wherein if the random access response is successfully detected and apreamble sequence identifier matching the transmitted preamble sequenceis detected in the random access response, the Message 3 generating andtransmitting module generates and transmits the Message 3 on atime-frequency resource designated by an uplink grant.

The apparatus for random access of a UE provided in this embodiment isas shown in FIG. 20 , and FIG. 20 is a schematic diagram for theapparatus for random access of a UE in Embodiment ten.

This embodiment provides an apparatus for random access of a basestation, where the apparatus obtains a beam number indication of a UE bydetecting a Message 3, where the apparatus comprises the followingmodules:

a random access resource configuration transmitting module fortransmitting a random access resource configuration information in amain information block in a broadcast channel or the system informationblock indicated by the main information block, the random accessresource configuration information including a configured random accesschannel resource and a random access preamble sequence resource;

-   -   a preamble sequence detection module for detecting a possible        transmitted preamble sequence on the random access channel        according to the configured random access configuration        information;    -   a random access response transmitting module for generating and        transmitting a random access response for the detected random        access preamble sequence, wherein the uplink grant of the        Message 3 is configured;    -   a Message 3 detection module for detecting a possible Message 3        transmission according to the configured uplink grant of the        Message 3, wherein the Message 3 contains an indication of the        number of beam that the UE has; and    -   a contention resolution transmitting module for generating and        transmitting contention resolution information if the Message 3        is successfully detected, and completing the random access        procedure.

In addition, the contention resolution transmitting module may alsotransmit CSI-RSs or SRSs configured for the UE. The number of theCSI-RSs or SRSs configured by the base station is determined accordingto the indication of the number of the beams of the UE that the UEreports in the Message 3.

An apparatus for random access of a base station provided in thisembodiment is shown in FIG. 33 , and FIG. 33 is a schematic diagram ofan apparatus for random access of a base station provided in thisembodiment.

Embodiment Eleven

In this embodiment, a method for random access of a UE is described.Specifically, a method for notifying the number of the beams of the UE(or the UE) in a random access procedure will be introduced incombination with a specific system. In this embodiment, the number ofthe beams of the UE is implicitly notified by a used random accessresource(s).

The system pre-defines that a maximum number of the beams that the UEcan support or the system can process is M, and M>0. According to M, thebase station divides the random access resources (including the randomaccess channel time-frequency resources and the random access preamblesequences) into M mutually-disjoint resources.

Division of the Random access resource includes following two types:

-   -   1. The random access channel time-frequency resources are        divided into M non-overlapping subsets, each of which        corresponds to one of the beam-numbers. The base station        notifies the UE of the M subsets of random access channel        time-frequency resources through the broadcast channel, the main        information block in the broadcast channel, or the system        information block indicated by the main information block in the        broadcast channel. With this type of resource division manner, a        system resource allocation may be distinguished as follows.        -   a) In the time domain, as shown in FIG. 21 . FIG. 21 is a            possible resource allocation diagram (time domain            distinction). M=7 non-overlapping time-frequency resources            correspond to 0 to 6 beams respectively. For the UE, when            the beam-number of the UE is between 0 and 5, the            time-frequency resource corresponding to the beam-number of            the UE is directly selected, and when the beam-number of the            UE is 6 or more, the time-frequency resource corresponding            to the beam-number 6 is selected.        -   b) In the frequency domain, as shown in FIG. 22 . FIG. 22 is            a possible resource allocation diagram (frequency domain            distinction). M=4 non-overlapping time-frequency resources            correspond to 0 to 3 beams respectively. Similarly, when the            beam-number of the UE is between 0 and 2, the time-frequency            resource corresponding to the beam-number of the UE is            directly selected, and when the beam-number of the UE is 3            or more, the time-frequency resource corresponding to the            beam-number 3 is selected.        -   c) In both time and frequency domains, as shown in FIG. 23 .            FIG. 23 is a schematic illustration of possible resource            allocation (time-frequency distinction). M=14            non-overlapping time-frequency resources represent 0 to 13            beams, respectively. Similarly, when the beam-number of the            UE is between 0 and 12, the time-frequency resource            corresponding to the beam-number is directly selected, and            when the beam-number of the UE is 13 or more, the            time-frequency resource corresponding to the beam-number 13            is selected. Especially, the time-frequency resources            corresponding to the respective beams may have different            sizes.

It should be noted that, when the with different numbers of beams aredistinguished by the time-frequency resources, the UEs with differentnumbers of beams may use the same preamble sequence resource pool, whichis also called a preamble sequence resource set.

-   -   2. The random access preamble sequence pool (also referred to as        preamble sequence resource pool or preamble sequence resource        set) is divided into M disjoint subsets, each subset        corresponding to one beam-number. The base station notifies the        UE of the M subsets of the preamble sequences through the        broadcast channel, the main information block in the broadcast        channel, or the system information block indicated by the main        information block in the broadcast channel. Possible        notification methods are as follows.        -   a) The index range of possible preamble sequences in each            preamble sequence subset is notified by indicating a            starting preamble sequence index of the first subset and a            number of the preamble sequences in each subset. A number of            the subsets, NBN, may also be notified together with the            configuration of the preamble sequence subset. FIG. 24 shows            a possible notification method, and FIG. 24 shows a possible            preamble sequence resource pool configuration and            notification method. In FIG. 24 , contents in the dashed            box, that is, the number of the subsets, M, may be notified            together with the preamble sequence resource pool            information, or may be separately notified in the random            access configuration information.        -   b) The index range of the possible preamble sequences in            each preamble sequence subset is notified by indicating the            starting preamble sequence index of each subset and a total            number of the preamble sequences. FIG. 25 shows a possible            notification method, and FIG. 25 shows another possible            preamble sequence configuration and notification method.

In addition to the above two methods, the configuration notificationmethod of the preamble sequence subset further includes: notifying thestarting preamble sequence index of the first preamble sequence subsetand the last preamble sequence index of each preamble sequence subset;or notifying the starting index of the each preamble sequence subset andthe number of the preamble sequences in the each preamble sequencesubset; or notifying the starting preamble sequence index of the eachpreamble sequence subset and the last preamble sequence index.

In another possible configuration of the preamble sequence, the preamblesequence is generated by using a basic sequence and covering codes. FIG.26 shows a possible preamble sequence structure in this case. FIG. 26 isa preamble sequence structure using the covering codes. In the structureof FIG. 26 , one preamble sequence is composed of the same or differentsequences, a Cyclic Prefix (CP) is added before each sequence, and aGuard Time (GT) is added after all the sequences. A preamble sequenceconsisting of N sequences is processed with a covering code w=[w1, . . ., wM] of length M, wherein each element in the mth sequence ismultiplied with the mth element wM in the covering code.

In this case, a possible configuration for the preamble sequence subsetis as follows: all preamble sequence subsets have the same basicsequence pool and different preamble sequence subsets adopt differentcovering codewords. That is, for the M subsets, M covering codes and abasic sequence resource pool are defined or preset. The mth preamblesequence subset consists of the base sequence resource pool and the mthcovering code. At this time, when the preamble sequence resource isconfigured, it is required to notify the first sequence index in thebasic sequence resource pool, the number of sequences in the basicsequence pool and an index range of available covering codes. When usingthis configuration method, the configuration is shown in FIG. 27 , andFIG. 27 is the configuration of the preamble sequence using the coveringcodes. If a form of the covering code is defined in advance, there is noneed to notify the index range of the covering codes, and only thenumber of the subsets, M, needs to be notified.

It should be noted that, for a case where the UEs with the differentbeam-numbers are distinguished by the preamble sequences, thetime-frequency resources of the random access channel of the UE may beuniformly configured, that is, the UEs with the different beam-numbersmay use the same random access channel time frequency resources. The UEswith the different beam-numbers may also use the different random accesschannel time-frequency resources. One possible way is that the randomaccess channel time-frequency resources are configured for the all UEsand the UEs with the different beam-numbers use the different preamblesequence subsets. That is, the UE selects the preamble sequence from thepreamble sequence subset corresponding to its own beam-number accordingto the beam-number, and transmits the selected preamble sequence on therandom access channel, and then the base station determines whichpreamble sequence subset the received preamble sequence belongs to, soas to determine the beam-number of the UE transmitting the preamblesequence according to the determined preamble sequence subset.

Another possible way is that a plurality of the random access channeltime-frequency resources are configured in the random access channelsand UEs with the different beam-numbers select random access occasions,which are consecutive but whose numbers are different, for transmittingthe preamble sequences, in order to facilitate the UEs to scantransmission beams. In particular, the UE may transmit the same preamblesequence selected as above using a plurality of different beamdirections on the plurality of different random access channels.

For a case where the beam-number is notified through different resourcesimplicitly, the behaviors at the UE are as follows.

Step 0: The UE obtains the random access configuration informationincluding the configuration of the random access resource subsetscorresponding to the different beam-numbers, wherein the random accessconfiguration information includes random access channel time-frequencyresources allocated to the UEs with the different beam-numbers, orpreamble sequence resource pool information allocated to the UEs withthe different beam-numbers.

Step 1: The UE selects the corresponding random access resourceaccording to its own beam-number, including the time-frequency resourceof the random access channel suitable for the UE with the beam-number orthe preamble sequence resource suitable for the UE with the beam-number,and generates the preamble sequence. Specifically, the different randomaccess resource subset corresponds to the different beam-numbers. Thatis, if the beam-numbers are different, the corresponding subsets ofrandom access resources are different. When the beam-numbers of the UEsare different, the random access time-frequency resources (also calledas the random access channels) selected by the UEs are different, or therandom access preamble sequences selected by the UEs are different. TheUE then transmits the preamble sequence on the corresponding randomaccess channel.

Step 2: The UE detects the random access response.

Step 3: The UE generates and transmits the Message 3 if the correctrandom access response is detected.

Step 4: The UE detects the contention resolution message.

Corresponding to the behaviors at the UE side, for the case where thebeam-number is notified through different resources implicitly, thebehaviors at the base station side is as follows.

Step 0: The base station allocates the random access resources for theUEs with the different beam-numbers, including the different randomaccess channel time-frequency resources or the different preamblesequence resources.

Step 1: The base station detects the transmission of the preamblesequence and determines the beam-number corresponding to thecorresponding resource (the random access channel time-frequencyresource or the preamble sequence).

Step 2: The base station generates and transmits a random accessresponse for the detected preamble sequence.

Step 3: The base station detects the transmission of the Message 3.

Step 4: The base station generates and transmits the contentionresolution message.

The interaction process between the base station and the UE would bedescribed with reference to FIG. 28 . FIG. 28 is a schematic diagram ofthe interaction process between the base station and the UE in theEmbodiment eleven.

In another embodiment, in the above step 4, the base station may includethe contention resolution information in a Message 4 together with theCSI-RSs or SRSs configured for the UE and transmit the Message 4 to theUE. Specifically, the base station configures for the UE the CSI-RSs orSRSs whose number corresponds to the determined beam-number of the UEaccording to the determined beam-number of the UE. If the beam-number ofthe UE determined by the base station is 4, the base station configuresfor the UE 4 CSI-RSs or SRSs corresponding to the beam-number 4 of theUE, wherein the number of the CSI-RSs or SRSs indicates the number oftimes that the same CSI-RS or SRS is repeatedly transmitted on thetime-frequency resources. Wherein,

-   -   1. The base station may use different beams to transmit the        configured CSI-RSs for the downlink beam management or        correction; or    -   2. The base station may use a same beam to transmit the        configured CSI-RSs for the uplink beam management or correction.

In still another embodiment, the base station may also notify theCSI-RSs or SRSs configured for the UE through a downlink channel (adownlink control channel or a downlink shared channel) for theuplink/downlink beam management, after the random access procedure iscompleted, wherein the number of the CSI-RSs or SRSs configured by thebase station is determined according to the beam-number of the UEdetermined by the base station.

With the solution in this embodiment, the base station may adjust inreal time a proportion of random access resources allocated to the UEswith the different beam reciprocity capability, according to aproportion of UEs with the different beam-numbers in a current cell.

Specifically, if the UEs with the different beam-numbers aredistinguished by using the random access channel time-frequencyresources described above, a density of the random access channeltime-frequency resources allocated to the UEs with the differentbeam-numbers may be adjusted, so as to adjust the proportion of therandom access resources assigned to the UEs with the differentbeam-numbers. For example, a time domain density of the time-frequencyresource subsets of the respective random access channels, for example,a number of occurrences of the time-frequency resource subsets of therandom access channel allocated to the UEs with the differentbeam-numbers in one subframe and the like, is adjusted. Such parametersmay be notified through random access channel configuration parameters,that is, the different random access channel time-frequency resourcesubsets have the different random channel configuration parameters.

If the UEs with the different beam-numbers are distinguished by usingthe preamble sequences as above, the proportion of random accessresources allocated to the UEs with the different beam-numbers may beadjusted by adjusting the numbers of preamble sequences included in thedifferent preamble sequence resource subsets. Such parameters may beadjusted by changing the numbers of the preamble sequences in thepreamble sequence subsets. A flowchart for adjusting random accessresources allocated to UEs with the different beam-numbers by the basestation is shown in FIG. 29 . FIG. 29 is a flowchart for adjustingrandom access resources allocated to UEs with the different beam-numbersin real time by the base station.

For the foregoing flow, the base station may periodically calculate theproportion of the UEs with the different beam-numbers among the accessedUEs and determine whether the random access resources need to beadjusted. The adjustment of the random access resources will lead to thechange of the system information carrying the random accessconfiguration information, and thus triggering a system informationchange process. If the UE is in a connected state, a new systeminformation is obtained according to a system information changeindication. If the UE is in a disconnected state (e.g., an idle state),the random access configuration information is obtained before eachrandom access attempt.

This embodiment provides an apparatus for a random access of a UE. Theapparatus implicitly reports the beam-number of the UE, that is, theapparatus implicitly notifies the base station of the beam-number of theUE by determining the random access resource (the time-frequencyresource or the preamble sequence resource), and the apparatus comprisesthe following modules:

-   -   a configuration information obtaining module for obtaining a        random access configuration information from a main information        block in a broadcast channel or a system information block        indicated by the main information block, wherein the        configuration information includes random access resources        (time-frequency resources or preamble sequence resources)        allocated to the UEs with the different beam-numbers;    -   a random access resource selection module for selecting the        random access resource (the time-frequency resource or the        preamble sequence resource) according to the beam-number of the        UE;    -   a preamble sequence transmitting module for generating a        preamble sequence and transmitting the generated preamble        sequence on the corresponding time-frequency resource, according        to the selected random access resource;    -   a random access response detection module for detecting the        random access response transmitted by the base station;    -   a Message 3 generating and transmitting module for generating        and transmitting the Message 3 according to the detected random        access response and the indication of the beam-number of the UE;        and    -   a contention resolution receiving module for receiving a        contention resolution information.

The foregoing apparatus for a random access of a UE is shown in FIG. 30. FIG. 30 is a schematic diagram of the apparatus for a random access ofa UE provided in Embodiment eleven.

In addition, the contention resolution receiving module may furtherreceive CSI-RS or SRS signals configured by the base station. The numberof the CSI-RS or SRS signals configured by the base station isdetermined according to the beam-number of the UE determined by the basestation.

The present disclosure provides an apparatus for allocating a randomaccess resource of a base station, the apparatus comprising thefollowing modules:

-   -   a UE beam-number calculation module for calculating the        proportions of the UEs with the different beam-numbers among        accessed UEs;    -   a random access resource allocation adjustment module for        adjusting random access resources (time-frequency resources or        preamble sequence resources) allocated to the UEs with the        different beam-numbers, according to the proportions of the UEs        with the different beam-numbers obtained by the calculation        module; and    -   a resource allocation information notification module for        notifying the UE of the adjusted random access resource        allocation information through the main information block in the        broadcast channel or the system information block indicated by        the main information block.

The above apparatus would be described with reference to FIG. 31 . FIG.31 is a schematic diagram of an apparatus for allocating a random accessresource of a base station according to Embodiment eleven.

The present disclosure provides a way of reporting information. The UEcan report the beam-number of the UE when the random access procedure iscompleted, by transmitting the Message 3 in the random access procedureor selecting the random access resources, so that the base station canknow the information on the beam-number of the UE as early as possible.After learning this information, the base station can perform subsequentprocedures such as scheduling, resource allocation, beam management andbeam correction more effectively. With the method provided by thepresent disclosure, an operation efficiency of the system can beimproved, and the procedures of resource allocation, beam management andbeam correction can be more effective.

In the prior art, the method for notifying a user equipment (UE) of timeinformation in LTE (Long Term Evolution) needs to separately considerbeam indication information and timing advance (TA) information, and ispossible to require an extra signaling overhead to notify the UE, whichcan cause unnecessary signaling overhead. Furthermore, in LTE, for anon-random access process, there is only one indication value of 6 bitsin size which may not be able to satisfy the situation that thevariation value of the TA due to beam switching in a beamforming systemis relatively large.

The embodiments of the present invention provide a way for notifyingtime information. The BS can notify the UE of a new TA or TA adjustmentin a beam indication. By combining with the beam indication, the new TAor TA adjustment can indicate whether there is a beam variation or not,and can indicate beam adjustment values with different sizes.

FIG. 34 is a schematic flowchart of notifying information provided byone embodiment of the present invention.

Step 101: A UE transmits an uplink signal to a BS; step 102: The BSreceives the uplink signal transmitted by the UE, and determines theuplink beam to be used by the UE and/or the TA information correspondingto the uplink beam to be used by the UE according to the uplink signal;step 103: the BS transmits beam indication information and/or the TAinformation to the UE; step 104: the UE receives the beam indicationinformation and/or the TA information transmitted by the BS, anddetermines the uplink beam to be used and/or the TA informationcorresponding to the uplink beam to be used according to the beamindication information and/or the TA information; step 105: The UEtransmits the uplink signal to the BS by using the determined uplinkbeam to be used and/or the determined TA information corresponding tothe determined uplink beam to be used.

Wherein, the beam indication information indicates the uplink beam to beused by the UE, and the TA information indicates the TA informationcorresponding to the uplink beam to be used by the UE.

Further, in step 103, the BS transmits beam indication informationand/or the TA information to the UE, which comprises at least one ofsteps 1031-1032 (not marked in the figures):

Step 1031: The BS transmits beam indication information and/or the TAinformation to the UE through downlink control information (DCI).

Wherein, a content indication indicating the type of information carriedin the DCI is further provided in the DCI.

Wherein, the TA information comprises: a TA or a TA adjustment.

Step 1032: The BS transmits beam indication information and/or the TAinformation to the UE through a same Medium Access Controlcontrol-element (MAC CE).

Wherein, content indication indicating the type of information carriedin the MAC CE is further provided in the MAC CE.

Wherein, the MAC CE comprises a TA group identifier (ID) of a firstpredetermined bit, beam indication information of a second predeterminedbit, a TA adjustment of a third predetermined bit and a padding bitvalue of a fourth predetermined bit. The sum of the first predeterminedbit, the second predetermined bit, the third predetermined bit and thefourth predetermined bit is an integral multiple of the seventhpredetermined bit value, and the TA group ID is used to identify thecorresponding TA group. And/or, the MAC CE comprises the TA group ID ofthe first predetermined bit, the beam indication information of thesecond predetermined bit, the TA of the fifth predetermined bit and thepadding bit value of the sixth predetermined bit, and the sum of thefirst predetermined bit, the second predetermined bit, the fifthpredetermined bit and the sixth predetermined bit is an integralmultiple of the eighth predetermined bit value.

Wherein, the seventh predetermined bit value and the eighthpredetermined bit value can be identical or not, which is not limited inthe embodiments of the present invention.

Further, in step 104, the step that the UE receives the beam indicationinformation and/or the TA information transmitted by the BS specificallycomprises: the UE receives a DCI carrying the beam indicationinformation and/or the TA information, which is transmitted by the BS;and/or the UE receives a MAC CE carrying the beam indication informationand/or the TA information, which is transmitted by the BS.

Further, when receiving the DCI carrying the beam indication informationand/or the TA information, which is transmitted by the BS, the UEdetermines the type of information carried in the DCI according to thenumber of bits of the received DCI and/or the situation that thepredetermined DCI includes the content indication, and the situationcomprises: the predetermined DCI format includes the content indicationor the predetermined DCI format does not include the content indicator.

Specifically, the step of determining the type of information carried inthe DCI according to the situation that the predetermined DCI includesthe content indication comprises:

determining the type of information carried in the DCI according to thecontent indication when the predetermined DCI format includes thecontent indication; determining the type of information carried in theDCI according to the predetermined DCI format when the predetermined DCIformat does not include the content indication.

Further, when the MAC CE carrying the beam indication information and/orthe TA information, which is transmitted by the BS, is received,determining the type of information carried in the MAC CE according tothe situation that the predetermined MAC CE includes the contentindication. The situation that the predetermined MAC CE includes thecontent indication comprises: the predetermined MAC CE format includesthe content indication, or the predetermined MAC CE format does notinclude the content indication.

Specifically, the step of determining the type of information carried inthe MAC CE according to the situation that the predetermined MAC CEincludes the content indication comprises:

-   -   determining the type of information carried in the MAC CE        according to the content indication when the predetermined MAC        CE format includes the content indication; determining the type        of information carried in the MAC CE according to the        predetermined MAC CE format when the predetermined MAC CE format        does not include the content indication.

Further, the UE acquires the beam indication information and/or the TAinformation according to the carried type of information.

Further, in step 102, the step that the BS determines the uplink beam tobe used by the UE and/or the TA information corresponding to the uplinkbeam to be used by the UE according to the uplink signal comprises:determining the individual beam quality information corresponding toeach uplink beam based on the received uplink signal; determining theuplink beam to be used by the UE according to the individual beamquality information corresponding to each uplink beam, and determinesthe TA information corresponding to the uplink beam to be used by the UEaccording to BS timing reference information.

Wherein, the beam quality information comprises: the received power ofthe corresponding uplink beam and/or the signal interference noise ratio(SINR) of the received signal.

Further, recording, by the BS, the individual beam quality informationand/or the individual TA information corresponding to each uplink beamavailable for the UE; and/or,

-   -   determining one from multiple uplink beam available for the UE        as a first uplink beam and recording the beam quality        information and/or TA information corresponding to the first        uplink beam and relative beam quality information and/or        relative TA information of each of the other uplink beams with        respect to the beam quality information and TA information of        the first uplink beam by the BS, when multiple uplink beams        exist.

Further, updating recorded beam quality information and/or correspondingTA information corresponding to a relevant uplink beam when it isdetected by the BS that beam quality information and/or TA informationcorresponding to any one of the uplink beams changes.

Further, the BS determines the TA information corresponding to theuplink beam to be used according to the TA information; and the step oftransmitting the uplink signal to the BS by using the TA informationcorresponding to the uplink beam to be used comprises the followingsteps a-b (not marked in the figures):

Step a: if the TA information is a TA, the UE determines that the TAinformation corresponding to the uplink beam to be used is a TA andtransmits the uplink signal to the BS by using the determined TAinformation corresponding to the uplink beam to be used.

Step b: if the TA information is a TA adjustment, the UE determines theTA information corresponding to the uplink beam to be used according tothe TA adjustment and transmits the uplink signal to the BS by using thedetermined TA information corresponding to the uplink beam to be used.

Further, step 105 specifically comprises: the UE transmits an uplinksignal to the BS by using the determined uplink beam to be used and/orthe determined TA information corresponding to the determined uplinkbeam to be used, according to a predetermined time interval or a timeinterval configured by the BS.

Further, when the time unit of uplink signal transmitted by using thedetermined TA information corresponding to the uplink beam to be usedand a previous time unit is overlapping, determining the priority of theservice data carried in each time unit; and transmitting preferentiallythe service data carried in the time unit with the highest service datapriority or transmitting preferentially the service data carried in theprevious time unit.

Wherein, the time unit comprises at least one of the following: asymbol, a group of symbols, a slot, a group of slots, a mini slot, agroup of mini-slots, a radio frame, a group of radio-frames, a systemframe and a group of system-frames.

The embodiments of the present invention provide a method for notifyinginformation. Compared with the prior art, the UE in the embodiments ofthe present invention transmits an uplink signal to a BS. The BS candetermine the uplink beam to be used by the UE and/or TA informationcorresponding to the uplink beam to be used according to the uplinksignal, and transmit the beam indication information carrying the uplinkbeam to be used and/or the TA information corresponding to the uplinkbeam to be used to the UE so that the UE can transmit the uplink signalaccording to the uplink beam and/or the corresponding TA information(i.e. the uplink beam corresponding to the UE which can be determined bythe BS and/or the TA information changed as the uplink beam changes),and can notify the UE of the determined uplink beam and/or thecorresponding TA information, so that the UE can be informed about thenew TA information.

Embodiment Twelve

The present invention provides a way for notifying information. In abeamforming communication system, a UE in a connected state transmits anuplink signal (for example, a sounding reference signal (SRS), aDemodulation Reference Signal (DMRS) in a Physical Uplink Shared Channel(PUCCH) or in a Physical Uplink Shared Channel (PUSCH), or directly thePUCCH or PUSCH data signal) to the BS. Therefore, the BS can decidewhether the beam currently used by the UE is a good beam, from detectingthe uplink signal to obtain the quality (for example, the size of thereceived power of each uplink beam, or the level size of the SINR of thereceived signal of each uplink beam) of the uplink beam of the UE. Ifthe BS finds that there is another uplink beam with better quality forthis UE, the BS can notify the UE of converting the used uplink beam.However, at this time, it is possible to cause a large change of the TAdue to the conversion of the beam. By detecting the uplink signal fromthe UE, the BS can further obtain the TA of the corresponding uplinkbeam and notify the UE of a TA adjustment, or a new TA together withbeam indication information, which helps the UE to perform more accurateuplink signal transmission.

The invention mainly comprises steps 1-3 (not marked in the figures):

Step 1: A UE transmits an uplink signal through uplink resources(including time-frequency resources, DMRS configuration, SRSconfiguration and/or so on) configured by a BS.

Step 2: The BS measures the received power of the corresponding uplinkbeam or the SINR of the uplink beam of the received signal through theuplink signal received from the UE, to determine the uplink beam thatshould be used by the UE.

Meanwhile, the TA of the corresponding beam of the UE is determined withreference to the timing reference measured by the BS. Then, the BSnotifies a user of the new beam indication information and the TAinformation through a downlink channel (for example, a downlink controlchannel, a downlink shared channel and a downlink broadcast channel).

1. The BS can notify the UE by placing the beam index information (forexample, Sounding Reference Signal resource indicator (SRI)) and TAinformation (for example, N bits of TA, or TA adjustment) into the DCI.

2. The BS can transmit a Medium Access Control Control-element (MAC CE)composed of the beam index information (for example, SRI) and the TAinformation (for example, N bits of TA, or the TA adjustment) to the UE.

Wherein, in the notification information transmitted to the UE by theBS, the BS can further reserve a content indication of M bits in the DCIor the MAC CE to notify the UE of the type of information contained inthe corresponding DCI or the MAC CE. If the content indication occupies1 bit, “0” indicates that the DCI or the MAC CE carries a TA adjustmentof 6 bits; and “1” indicates that the DCI or the MAC CE carries a TA of11 bits.

Step 3: The UE receives the beam indication information transmitted bythe BS, and reads new beam index information and/or TA informationtherefrom.

1. The UE converts the uplink beam into the uplink beam indicated by theBS according to the indicated beam index information. The UE applies thenew uplink beam according to a predetermined time interval or a timeinterval configured by the BS, for example, the system preconfigures touse the new uplink beam to perform uplink date transmission after T1subframes.

2. The UE determines a new TA according to the indicated TA adjustmentor TA to transmit the uplink signal, and applies the new TA according toa predetermined time interval or a time interval configured by the BS.For example, the system is preconfigured to use the new TA after T2subframes to perform the uplink date transmission; or can bepreconfigured to use the new TA according to the same time interval thatthe application is configured with the new uplink beam, that is, it ispreconfigured to use the new TA after T1 subframes to use the uplinksignal.

In addition, after the determined new TA is used, this will result in anoverlap between the previous subframe and the subframe after theprevious subframe. At this time, the UE decides which subframe will bepreferentially completed about data transmission according to the datapriority carried by the two overlapping subframes.

For example:

-   -   1. when the subframe after the previous subframe is a service        with a higher priority relative to the previous subframe, as        shown in FIG. 35 . For example, when the subframe after the        previous subframe will transmit URLLC service data with high        reliability and low latency and the previous subframe transmits        normal eMBB data, then when there is an above-mentioned case of        the overlap between the subframe after the previous subframe and        the previous subframe, the UE can execute a) and/or b):    -   a) Preferentially ensure to achieve the transmission of the        complete URLLC service;    -   b) Preferentially ensure to achieve the transmission of the        complete service of the previous subframe.    -   2. When the subframe after the previous subframe is a service        with a same or similar priority or lower priority relative to        the previous subframe, as shown in FIG. 36 . If the transmission        of both the previous and the subframe after the previous        subframes are service data of eMBB, then when there is an        above-mentioned case of the overlap between the subframe after        the previous subframe and the previous subframe, the UE can        preferentially ensure to achieve the transmission of the service        of the previous subframe.

Wherein, the subframe here is used as an example of a time unit, whichcan also be replaced by other time units, for example, a symbol, a slot,a mini slot, a radio Frame, etc., and combination of one or more of theabove time units.

Embodiment Thirteen

This embodiment will introduce changes of the used beam and possible TAwhich are used for notifying a user by constructing an MAC CE or a DCIformat. In a beamforming communication system, a UE in a connected statetransmits an uplink signal (for example, an SRS, a DMRS in a PUCCH or aPUSCH, or directly a PUCCH or PUSCH data signal) to a BS. Therefore, theBS can obtain the quality (for example, the size of the received powerof each uplink beam for receiving signal, or the level size of the SINRof the received signal of each uplink beam) of the uplink beam of the UEfrom detecting the uplink signal to obtain the quality, so as todetermine whether the beam currently used by the UE is a good beam. Forexample, if finding that there is another uplink beam with betterquality for this UE, the BS can notify the UE of converting the useduplink beam. However, at this time, it is possible to cause a largechange of the TA due to the conversion of the beam. By detecting theuplink signal from the UE, the BS can further obtain the TA of thecorresponding uplink beam and notify the UE of a TA adjustment, or a newTA together with beam indication information, which helps the UE toperform more accurate uplink signal transmission.

The main steps of the embodiments of the present invention are asfollows:

Step 1: A UE transmits an uplink signal through uplink resources(including time-frequency resources, DMRS configuration, SRSconfiguration and/or so on) configured by a BS.

Step 2: The BS measures the received power of the corresponding uplinkbeam or the SINR of the uplink beam of the received signal through theuplink signal received from the UE, to determine the uplink beam thatshould be used by the UE. Meanwhile, the TA of the corresponding beam ofthe UE is determined with reference to the timing reference measured bythe BS. Then, the BS notifies a user of the new beam indicationinformation and the TA information through a downlink channel (forexample, a downlink control channel, a downlink shared channel and adownlink broadcast channel).

Wherein, in a multi-beam system, the UE may have multiple uplinktransmitting beams. Therefore, the BS may be required to maintain andrecord the beam quality and TA of each beam for the multiple differentuplink beams, and possible ways are as follows:

-   -   1. The BS independently maintains and records the beam quality        and/or TA of each uplink beam of the UE. If the UE has 3 uplink        beams, at the BS side, the BS respectively records the beam        quality and/or TA of the three beams. The old beam quality        and/or TA are replaced by the updated new beam quality and/or TA        obtained after the next new uplink signal measurement.    -   2. The BS relatively maintains and records the beam quality        and/or TA of the uplink beam of the UE. For example, if the UE        has 3 uplink beams, which are beams 1, 2 and 3, respectively. At        the BS side, the BS selects and records the beam quality and/or        TA of one of the beams (for example, the beam 1), and the        selection can be based on a random selection of equal        probabilities or according to the quality of the beams. For        example, selecting the beam with the highest beam quality or        recording the beam with lowest beam quality; and recording the        relative beam quality values and/or relative TAs of the beam 2        and beam 3 relative to the beam 1. When there is updated beam        quality and/or TA measurement value after the next new uplink        signal measurement, the old beam quality and/or TA are replaced.        Meanwhile, the relative beam quality and/or relative TA of the        beam 2 and beam 3 relative to the beam 1 are further updated, to        replace the old relative beam quality and/or relative TA        relative to the beam 1.

In addition, the way in which the BS notifies the UE can be:

-   -   1. DCI; the UE can be notified by placing the beam index        information and TA information into the DCI.    -   2. MAC CE; it can be transmitted to the UE by placing the beam        index information and/or TA information into the same MAC CE.

Wherein,

-   -   a) Beam index information, that is, by which the resource index        of the uplink beam can be identified, such as the SRI.    -   b) TA information, that is, the TA of N_(ta) bits of the uplink        transmission of the UE or the TA adjustment of the N_(ta-adjust)        bits relative to the old TA can be identified. For example,        similar to that in a LTE system, the TA is a complete N_(ta)=11        bits, the UE can directly convert the 11 bits into the TA of the        uplink transmission; or the UE can use the TA adjustment of        N_(ta-adjust)=6 bits, and then the UE needs to calculate the new        TA based on the old TA.

When downlink control information is used for transmission, thecorresponding DCI format can be:

-   -   The content indication can be 1 or 2 bits. The meaning of this        content indication is:    -   If the size of the content indication is 1 bit:    -   When the content indication is “0”, it is characterized what the        DCI carries is the beam indication information and the TA (or        the TA adjustment); the beam indication information identifies        that the UE uses the uplink beam different from the previous        uplink beam.    -   When the content indication is “1”, it indicates that the DCI        carries the TA (or the TA adjustment) and does not carry the        beam indication information. The meaning of not carrying the        beam indication information indicates that the UE uses the same        uplink beam as the previous uplink beam.

Or,

-   -   When the content indication is “0”, it indicates that the DCI        carries the beam indication information and the TA; the beam        indication information identifies the uplink beam should be used        by the UE, which may be the same as or different from the uplink        beam used previously.    -   When the content indication is “1”, it indicates that the DCI        carries the beam indication information and the TA adjustment.        The beam indication information identifies the uplink beam        should be used by the UE, which may be the same as or different        from the uplink beam used previously.

Or,

-   -   If Size_dci is less than or equal to a predetermined threshold        value, then when the content indication is “0”, it indicates        what the DCI carries is a TA adjustment; when the content        indication is “1”, it indicates what the DCI carries is a TA; in        both cases, no beam indication information is carried in the        DCI, that is, it indicates that the UE uses the same uplink beam        as the previous uplink beam.        -   Wherein, the Size_dci is characterized that the size of the            DCI received by the UE, such as the number of bits after the            CRC being removed, or the number of bits including the CRC.    -   If Size_dci is greater than a predetermined threshold value,        then when the content indication is “0”, it indicates that the        DCI carries the beam indication information and the TA        adjustment; when the content indication is “1”, it indicates        that the DCI carries the beam indication information and the TA;        in both cases, the DCI has the beam indication information,        which indicates that the UE uses the uplink beam different from        the previous uplink beam.

Wherein, the Size_dci indicates the size of the DCI received by the UE,such as the number of bits after the CRC is removed or the number ofbits including the CRC.

It is worth noting that the meanings of the above “0” and “1” can beexchanged, which will not be limited in the embodiments of the presentinvention.

-   -   If the size of the content indication is 2 bits (as shown in        Table 3):    -   When the content indication is “00”, it is characterized what        the DCI carries is a TA adjustment; wherein, the meaning of not        carrying the beam indication information is characterized that        the UE uses the same uplink beam as the previous uplink beam.    -   When the content indication is “01”, it is characterized what        the DCI carries is a TA; wherein, the meaning of not carrying        the beam indication information is characterized that the UE        uses the same uplink beam as the previous uplink beam.    -   When the content indication is “10”, it is characterized what        the DCI carries is beam indication information and a TA        adjustment; and the beam indication information is characterized        that the UE uses the uplink beam different from the previous        uplink beam.    -   When the content indication is “11”, it is characterized what        the DCI carries is beam indication and a TA; and the beam        indication information is characterized that the UE uses the        uplink beam different from the previous uplink beam.

It should be noted that the meanings of the above “00”, “01”, “10” and“11” can be exchanged, which will not be limited in the embodiments ofthe present invention.

TABLE 3 Meaning example of bit content indication Contentindicationvalue Meaning (contents carried in DCI) 00 No beam indicationinformation and there is a TA adjustment 01 No beam indicationinformation and carrying a TA 10 There are beam indication informationand a TA adjustment 11 There are beam indication information and a TA

Specifically, when the part of the TA (or the adjustment value) carriedin the DCI is with a fixed size (such as being fixed as N to bits), theUE can perform different processing on the received TA (or TAadjustment) according to the different content indications, for example:

-   -   If the size of the content indication is 1 bit, then:    -   When the content indication is “0”, it is characterized what the        DCI carries is beam indication information and a TA; at this        time, N_ta represents the complete TA, and the UE reads the        complete N_ta bits to obtain a new TA. What the beam indication        information identifies is the uplink beam that should be used by        the UE, which may be the same as or different from the uplink        beam used previously.    -   When the content indication is “1”, it is characterized what the        DCI carries is beam indication information and a TA adjustment.        At this time, the high or low N_ta-adjust of the N to is        characterized as the complete TA. The UE reads high or low        N_ta-adjust bits to obtain a new TA adjustment and calculate a        new TA. What the beam indication information identifies is the        uplink beam that should be used by the UE, which is possible to        be the same as or different from the uplink beam previously        used; as shown in the example of FIG. 37 , the padding bits can        be all 0 bit or all 1 bit or any bit.

Or,

-   -   When Size_dci is less than or equal to a predetermined threshold        value, similar to the last way, the content indication can also        be used to indicate different processing performed by the UE on        the received TA information. The processing way is similar to        the above and will not be described in detail again. The DCI        does not carry beam indication information, which indicates that        the UE uses the same uplink beam as the previous uplink beam.

Wherein, the Size_dci is characterized that the size of the DCI receivedby the UE, such as the number of bits after the CRC being removed, orthe number of bits including the CRC.

-   -   When Size_dci is greater than a predetermined threshold value,        similarly to the last way, the content indication can also be        used to indicate different processing performed by the UE on the        received TA content. The processing way is similar to the above        and will not be described in detail again. The DCI carries beam        indication information, which indicates that the UE uses the        uplink beam different from the previous uplink beam.

Wherein, the Size_dci is characterized that the size of the DCI receivedby the UE, such as the number of bits after the CRC being removed, orthe number of bits including the CRC.

It is worth noting that the meanings of the above “0” and “1” can beexchanged, which will not be described in detail again.

-   -   If the size of the content indication is 2 bits, a similar        configuration can also be used as following:    -   When the content indication is “00”, it is characterized what        the DCI carries is a TA adjustment; the UE reads high or low        N_ta-adjust of the N to bits to obtain a new TA adjustment; the        meaning of not carrying the beam indication information is        characterized that the UE uses the same uplink beam as the        previous uplink beam;    -   When the content indication is “01”, it is characterized what        the DCI carries is a TA; the UE reads a complete N_ta bits to        obtain a new TA; the meaning of not carrying the beam indication        information is characterized that the UE uses the same uplink as        the previous uplink beam;    -   When the content indication is “10”, it is characterized what        the DCI carries is beam indication information and a TA        adjustment; the UE reads high or low N_ta-adjust bit among the N        to bits to obtain a new TA adjustment; the beam indication        information is characterized that the UE uses the uplink beam        different from the previous uplink beam;    -   When the content indication is “11”, it is characterized what        the DCI carries is beam indication information and a TA; the UE        reads the complete N_ta bits to obtain a new TA; the beam        indication information is characterized that the UE uses the        uplink beam different from the previous uplink beam;

It should be noted that the meanings of the above “00”, “01”, “10” and“11” can be exchanged.

-   -   The content indication can be N_bi bits, and this content        indicates the uplink beam index information used by the UE,        which is indicated by the BS;

and/or

-   -   The TA adjustment is Nta-adjust bits, and the contention        indicates the offset used by the UE relative to the old TA        (which can be represented as TA_old), which is indicated by the        BS; for example, TA_new=f(TA_old, TA_adjust).

and/or

-   -   The TA is Nta bits, and the content indicates the new TA (which        can be represented as TA_new) used by the UE, which is indicated        by the BS;

Specifically, when content indication is not included in a DCI design,the UE is notified by selecting the beam indicator with a fixed formatand/or TA information (TA or TA adjustment).

For the embodiments of the present invention, when MAC CE is used fortransmission, the corresponding MAC CE format can be:

-   -   This beam and TA indication command MAC CE is determined by a        corresponding logical channel ID (LCID) in the MAC PDU        subheader. For example, when LCID=01011, as shown in the        following Table 4, which is characterized of the beam and the TA        indication command. Or, the index of the TA command in LTE can        be extended, that is, the LCID of the TA command in LTE is        reused to identify the beam and the TA indication command.

TABLE 4 Example Table of the LCID Value for a downlink shared channelValue of LCID Meaning of a logical channel . . . . . . 01011 Beam and TAIndication Command 11011 Activate/deactivate 11100 UEcontention-resolution ID . . . . . .

For the embodiments of the present invention, the MAC CE has a fixedsize, and the number of bits contained therein is an integer multiple of8 bits, that is, being aligned with Octet.

Mode 1: The MAC CE includes a TA group ID of Ntagid bits, a beamindication information of N_bi bits, and a TA adjustment TAcommand ofNta-adjust bits, where N_macce=Ntagid+N_bi+Nta-adjust+N_paddingbit;wherein, N_paddingbit is used to complement the number of bits of theMAC CE so that it can satisfy the integer multiple of 8 bits, whereN_paddingbit=8*

$\left\lceil \frac{{Ntagid} + N_{\_{bi}} + {{N\_ ta} - {adjust}}}{8} \right\rceil$

−(Ntagid+N_bi+Nta-adjust); ┌x┐ represents the smallest integer greaterthan x; and the padding bits can be all 0 bits or all 1 bits.

Mode 2: The MAC CE includes the TA group ID of Ntagid bits, the TAindication information of N_bi bits and the TA of Nta bits, whereN_macce=Ntagid+N_bi+Nta+N_paddingbit;

-   -   wherein, N_paddingbit is used to complement the number of bits        of the MAC CE so that it can satisfy an integer multiple of 8        bits.        N_paddingbit=8*┌(N_(tagid)+N_bi+N_(ta))/8┐−(Ntagid+N_bi+Nta);        ┌x┐ represents the smallest integer greater than x; the padding        bits can be all 0 bits or all 1 bits; as shown in FIG. 38 , for        example, if the TA group ID of Ntagid=2 bit, the beam indication        information of N_bi=12 bits and the TA of Nta=11 bit, then        N_paddingbit=8* ┌(2+12+11)/8┐−(2+12+11)=8*4−25=7; then        N_macce=32.

For the embodiments of the present invention, for the same UE, a TAgroup ID can have multiple serving cells. For example, in the scenarioof carrier aggregation CA, it is possible that there are severalcarriers (may also be called as cells) has the same TA, which forms a TAgroup and shares the same TA value, and different TA groups can havedifferent TA values; different TA values can also be allocated fordifferent carriers, and the TA values allocated to the UEs in differentcells can also be different.

For the embodiments of the present invention, in the notificationinformation to the UE, the content indication of M bits can also bereserved in the MAC CE to notify of the type of information contained inthe corresponding MAC CE. As shown in FIG. 39 , the content indicationis 1 bit, “0” is characterized that the MAC CE carries the TA adjustmentof N_ta-adjust bits, “1” is characterized that the MAC CE carries the TAof N to bits; meanwhile, similar to the above description, the UE canread the high or low N_ta-adjust bits among the timing information bitsaccording to the different content indications to obtain the TAadjustment, or read the complete TA of N to bits.

It should be noted that the position of each information field in theMAC CE in FIG. 39 can be exchanged. And it will not be described indetail again in the embodiments of the present invention.

Step 3: The UE receives the beam indication information and the TAinformation transmitted by the BS, and reads the new beam indexinformation and/or TA information therefrom.

1. Converting the uplink beam into the uplink beam indicated by the BSaccording to the indicated beam index information; and applying a newuplink beam according to a predetermined time interval or the timeinterval configured by the BS, for example, the system preconfigures touse a new beam after T1 subframes to perform uplink data transmission.

2. Determining the new TA value according to the indicated TA adjustmentor the TA value for uplink signal transmission; and applying a new TAvalue according to the predetermined time interval or a time intervalconfigured by the BS, for example, the system preconfigures to use thenew TA after T2 subframes to perform the uplink date transmission; orcan the system preconfigures to use a new TA value according to the sametime interval with the new uplink beam, that is, preconfigures to usethe new TA value after T1 subframes to perform the uplink signaltransmission.

In addition, after the determined new TA is used, this will result in anoverlap between the previous subframe and the subframe after theprevious subframe. At this time, the UE decides which subframes will bepreferentially completed about data transmission according to the datapriority carried by the two overlapping subframes.

For example:

1. When the subframe after the previous subframe is a service with ahigher priority, as shown in FIG. 35 . For example, when the subframeafter the previous subframe will transmit URLLC service data with highreliability and low latency and the previous subframe transmits normaleMBB data, then when there is an above-mentioned case of the overlapbetween the subframe after the previous subframe and the previoussubframe, the UE can:

-   -   a) Preferentially ensure to achieve the transmission of the        complete URLLC;    -   b) Preferentially ensure to achieve the transmission of the        complete service of the previous subframe.

2. When the subframe after the previous subframe is a service with asame or similar priority or lower priority relative to the previoussubframe, as shown in FIG. 36 . If the transmission of both the previousand subframe after the previous subframes is service data of eMBB, thenwhen there is an above-mentioned case of the overlap between thesubframe after the previous subframe and the previous subframe, the UEcan preferentially ensure to achieve the transmission of the service ofthe previous subframe.

It is worth noting that subframes herein can be used as an example of atime unit, and can also be replaced by other time units, such as asymbol, a group of symbols, a slot, a group of slots, a mini slot, amini slot group, a radio frame, a radio frame group, a system frame anda system frame group, etc., and a combination of one or more of theabove time units.

An embodiment of the present invention provides a base station (BS). Asshown in FIG. 40 , the BS comprise: a first receiving module 71, a firstdetermining module 72 and a first transmitting module 73, wherein,

The first receiving module 71 is configured to receive an uplink signaltransmitted by a user equipment (UE).

The first determining module 72 is configured to determine the uplinkbeam to be used by the UE and/or timing advance (TA) informationcorresponding to the uplink beam to be used by the UE according to theuplink signal received by the first receiving module 71.

The first transmitting module 73 is configured to transmit the beamindication information and/or the TA information determined by the firstdetermining module 72 to the UE.

Wherein, the beam indication information indicates the uplink beam to beused by the UE, and the TA information indicates the TA informationcorresponding to the uplink beam to be used by the UE.

According to the BS provided in this embodiment of the presentinvention, compared with the prior art, a UE in the present inventiontransmits an uplink signal to a BS, and the BS can determine an uplinkbeam to be used by the UE and/or TA information corresponding to theuplink beam to be used according to the uplink signal, and transmit thebeam indication information carrying the uplink beam to be used and/orthe TA information corresponding to the uplink beam to be used to theUE, so that the UE can transmit the uplink signal according to theuplink beam and/or the corresponding TA information (i.e. the uplinkbeam corresponding to the UE which is can be determined by the BS and/orthe TA information changed as the uplink beam changes), and can notifythe UE of the determined uplink beam and/or the corresponding TAinformation, so that the UE can be notified of the new TA information.

The BS provided in this embodiment of the present invention canimplement the foregoing method embodiments. For the specific functionimplementation, please refer to the explanation in the methodembodiments, and will not be described here.

An embodiment of the present invention provides a user equipment (UE).As shown in FIG. 41 , the UE comprises a second transmitting module 81,a second receiving module 82 and a second determining module 83,wherein,

The second transmitting module 81 is configured to transmit an uplinksignal to a base station (BS).

The second receiving module 82 is configured to receive beam indicationinformation and/or timing advance (TA) information transmitted by theBS.

The second determining module 83 is configured to determine an uplinkbeam to be used and/or TA information corresponding to the uplink beamto be used according to the beam indication information and/or TAinformation received by the second receiving module 82.

The second transmitting module 81 is further configured to transmit theuplink signal to the BS by using the determined uplink beam to be usedand/or the determined TA information corresponding to the determineduplink beam to be used determined by the second determining module 83.

According to the UE provided in this embodiment of the presentinvention, compared with the prior art, a UE in the present inventiontransmits an uplink signal to the BS, and the BS can determine an uplinkbeam to be used by the UE and/or TA information corresponding to theuplink beam to be used according to the uplink signal, and transmit thebeam indication information carrying the uplink beam to be used and/orthe TA information corresponding to the uplink beam to be used to theUE, so that the UE can transmit the uplink signal according to theuplink beam and/or the corresponding TA information (i.e. the uplinkbeam corresponding to the UE which is can be determined by the BS and/orthe TA information changed as the uplink beam changes), and can notifythe UE of the determined uplink beam and/or the corresponding TAinformation, so that the UE can be notified of the new TA information.

The UE provided in this embodiment of the present invention canimplement the foregoing method embodiments. For a specific functionimplementation, please refer to the explanation of the method embodimentand will not be repeated in detail herein.

Wherein, the timing advance configuration information is specificallytiming advance configuration precision information or timing advanceconfiguration unit information.

The method for acquiring configuration of timing advance according tothe present invention, the procedures of which are shown in FIG. 43 ,comprises steps of:

-   -   acquiring, by a terminal, random access configuration        information for random access, the random access configuration        information including a random access preamble format, random        access preamble resource pool information, random access channel        configuration information, etc.;    -   determining, by the terminal, a random access channel and a        random access preamble according to the random access channel        configuration information;    -   transmitting, by the terminal, the random access preamble on the        determined random access channel;    -   detecting a random access response, and acquiring timing advance        configuration information carried in the random access response        and uplink authorization information, by the terminal;    -   determining, by the terminal, timing advance configuration        granularity information according to the random access preamble        format; and    -   selecting an Msg3 time-frequency resource according to the        uplink authorization information and the determined timing        advance configuration granularity information, determining a        timing sequence, and transmitting the Msg3, by the terminal.

The method for acquiring configuration of timing advance will bespecifically explained by the process on the terminal side and theprocess on the base station side, respectively. FIG. 44 shows theprocess on the terminal side. The method specifically comprises thefollowing steps.

S301: Random access configuration information is acquired.

Wherein, random access channel configuration information is carried inthe random access configuration information.

S302: A random access preamble is transmitted according to the randomaccess configuration information.

Specifically, a random access channel and a random access preamble aredetermined according to the random access channel configurationinformation, and the random access preamble is transmitted on the randomaccess channel.

S303: A random access response is detected and first timing advanceconfiguration information carried in the random access response isacquired.

S304: Second timing advance configuration information is determinedaccording to the random access configuration information and/or thefirst timing advance configuration information, and a timing advance isdetermined according to the second timing advance configurationinformation.

In this step, specifically, there are following several ways todetermine second timing advance configuration information according tothe random access configuration information and/or the first timingadvance configuration information:

1) wherein, random access preamble configuration information is carriedin the random access configuration information, and the determiningsecond timing advance configuration information according to the randomaccess configuration information and/or the first timing advanceconfiguration information comprises steps of:

-   -   determining timing advance interval configuration information        according to the random access preamble configuration        information; and    -   determining second timing advance configuration information        according to the timing advance interval configuration        information and/or the first timing advance configuration        information.

Further, timing advance interval configuration information is determinedaccording to the random access preamble configuration information,wherein the random access preamble configuration information and thetiming advance interval configuration information satisfy apredetermined mapping rule.

Further,

-   -   a mapping rule between reference random access preamble        configuration information and timing advance interval        configuration information is preconfigured, and the timing        advance interval configuration information is determined        according to a proportional relation between the random access        preamble configuration information and the reference random        access preamble configuration information and the mapping rule;        and    -   the random access preamble configuration information is random        access preamble subcarrier interval information.

2) first index information is carried in the random access configurationinformation, and the determining second timing advance configurationinformation according to the random access configuration informationand/or the first timing advance configuration information comprisessteps of:

-   -   inquiring a first index table according to the first index        information to acquire timing advance interval configuration        information corresponding to the first index information in the        first index table; and    -   determining second timing advance configuration information        according to the timing advance interval configuration        information and/or the first timing advance configuration        information.

3) random access preamble configuration information is carried in therandom access configuration information, and the determining secondtiming advance configuration information according to the random accessconfiguration information and/or the first timing advance configurationinformation comprises steps of:

-   -   determining timing advance configuration bit length information        according to the random access preamble configuration        information; and    -   determining second timing advance configuration information        according to the timing advance configuration bit length        information and/or the first timing advance configuration        information.

Further, timing advance configuration bit length information isdetermined according to the random access preamble configurationinformation, wherein the random access preamble configurationinformation and the timing advance configuration bit length informationsatisfy a predetermined mapping rule.

4) second index information is carried in the random accessconfiguration information, and the determining second timing advanceconfiguration information according to the random access configurationinformation and/or the first timing advance configuration informationcomprises steps of:

-   -   inquiring a second index table according to the second index        information to acquire timing advance configuration bit length        information corresponding to the second index information in the        second index table; and    -   determining second timing advance configuration information        according to the timing advance configuration bit length        information and/or the first timing advance configuration        information.

Further, the determining timing advance according to the second timingadvance configuration information comprises a step of:

-   -   determining timing advance according to the first timing advance        configuration information, the determined timing advance        configuration bit length information, and the timing advance        interval configuration information determined according to the        random access configuration information.

This step further comprises steps of:

-   -   receiving timing advance adjustment indication information        transmitted by a base station, and determining timing advance        adjustment amount configuration information according to the        timing advance adjustment indication information and        preconfigured uplink data transmission subcarrier spacing        information;    -   determining timing advance adjustment amount information        according to the uplink data transmission subcarrier spacing        information and the determined timing advance adjustment amount        configuration information; and    -   wherein the preconfigured uplink data transmission subcarrier        spacing information is specifically uplink data transmission        subcarrier spacing information preconfigured by a terminal or        received uplink data transmission subcarrier spacing information        which is preconfigured and then transmitted by a base station.

Wherein, determining timing advance adjustment amount informationaccording to the uplink data transmission subcarrier spacing informationand the determined timing advance adjustment amount configurationinformation specifically comprises steps of:

-   -   inquiring a third associative mapping list according to the        uplink data transmission subcarrier spacing information to        acquire timing advance adjustment amount interval information        corresponding to the uplink data transmission subcarrier spacing        information in the third associative mapping list; and    -   calculating timing advance adjustment amount information        according to the timing advance adjustment amount interval        information and the timing advance adjustment amount        configuration information.

This step further comprises a step of:

-   -   determining the adjusted timing advance according to the timing        advance adjustment amount information and the determined timing        advance.

Wherein, the random access preamble configuration information isspecifically random access preamble format information and/or randomaccess preamble subcarrier spacing information.

Still further, Msg3 is transmitted according to uplink authorizationinformation carried in the random access response and the determinedtiming advance.

In this step, Msg3 is transmitted according to uplink authorizationinformation carried in the random access response and the determinedtiming advance, comprising:

-   -   determining an Msg3 time-frequency resource and a timing        sequence according to the uplink authorization information and        the determined timing advance; and    -   transmitting the Msg3 by the Msg3 time-frequency resource on the        timing sequence.

Wherein, the process in the random access process mentioned in the abovesteps is specifically the process in the contention-free random accessprocess.

FIG. 45 shows the process on the base station side. The methodspecifically comprises the following steps.

S401: Random access configuration information is transmitted to aterminal.

S402: A random access preamble transmitted by the terminal according tothe random access configuration information is received.

S403: Random access process is performed according to the random accesspreamble, and a random access response carrying first timing advanceconfiguration information is transmitted so that the terminal determinestiming advance according to the first timing advance configurationinformation and/or the random access configuration information.

During this process, specifically:

-   -   (1) first index information is carried in the random access        configuration information; and    -   (2) second index information is carried in the random access        configuration information; and

The method for acquiring configuration of timing advance according tothe present invention will be specifically explained below by fourembodiments.

Embodiment Fourteen

In Embodiment fourteen, a method for acquiring configuration of timingadvance will be described below in combination with a specific system.The system supports several random access preamble formats, anddifferent random access preamble formats supports different cellradiuses. The random access preamble formats and other configurationinformation necessary for the random access process are transmitted inRemaining Minimum System Information (RMSI) or Other System Information(OSI). Meanwhile, the timing advance configuration granularityinformation can be predetermined or configured by the system in the RMSIor OSI.

One possible way of determining timing advance configuration granularityinformation is to establish, by means of predetermining, a relationbetween the random access preamble format and the timing advanceconfiguration granularity information. For example, the unit of timingadvance is specified. As the unit, sampling intervals Ts may be used.One possible example is shown in Table 5.

TABLE 5 Relation between the random access preamble format and thetiming advance configuration unit information Timing advanceconfiguration Random access unit information preamble format (Ts) 0 A1 1A2 2 A3 . . . . . .

Under the consideration that there is a direct relation between a randomaccess preamble format and a supported cell radius, and due to differentapplication scenarios, several random access preamble formats mayprovide similar cell radius supporting capacity. Therefore, same timingadvance configuration unit information may be configured for the severalrandom access preamble formats.

For example, one possible way is to define the size of Ts (value relatedto the sampling rate) and determine the timing advance configurationunit information (an integral multiple of Ts) according to a randomaccess preamble format and a supported cell radius. One simple exampleis shown in Table 6, where Ts=1/(64*30.72*106).

TABLE 6 Relation between the random access preamble formats and thetiming advance configuration unit information Timing advanceconfiguration unit Supported Random access information cell radiuspreamble format (Ts) (km) A0, B0, B1 1*32  5 A1, B2, B3 1*64 10 A2, A3,B4 2*64 20 . . . . . .

In the above way of configuring TA, it is assumed that the random accesspreamble format contains subcarrier spacing information. In other ways,the random access preamble format and the subcarrier spacing areconfigured separately. That is, the random access preamble format isdefined with reference to the subcarrier spacing, and parameteradjustment is performed on the random access preamble format in an equalproportion when the subcarrier spacing changes. For example, when thesubcarrier spacing is 15 kHz, random access preamble formats A0-A3,B0-B4, C0-C1 or more are defined. When the subcarrier spacing is anintegral multiple of 15 kHz, time-domain parameters (including CPlength, sequence length, etc.) are scaled down in an equal proportionaccording to the integral multiple. Meanwhile, the supported cell radiuswill also be scaled down in an equal proportion according to theintegral multiple.

In this case, the TA configuration unit information may still bedetermined in the way shown in Table 6, by means of establishing acorresponding relation between the timing advance configuration unitinformation and the random access preamble plus the subcarrier spacing.By this method, one simple example is shown in Table 7, whereTs=1/(64*30.72*106).

TABLE 7 Relation between the random access preamble formats and thetiming advance configuration unit information Timing advance Subcarrierconfiguration unit Supported Random access spacing information cellradius preamble format (kHz) (Ts) (km) A0, B0, B1 15 1*32 5 A1, B2, B315 1*64 10 A2, A3, B4 15 2*64 20 A0, B0, B1 30 1*16 2.5 A1, B2, B3 301*32 5 A2, A3, B4 30 1*64 10 . . . . . .

It is to be noted that, in the practical notification and configurationways, the supported cell radius may not be configured, preset andnotified, and instead, only the random access preamble format, thesubcarrier spacing and the timing advance configuration unit informationare notified, preset and configured.

In other processing ways, the timing advance configuration unitinformation corresponding to the random access preamble format at areference subcarrier spacing is defined. At other subcarrier spacings,the timing advance configuration unit information is acquired by scalingin an equal proportion. One simple example is that, at a referencesubcarrier spacing of 15 kHz, the relation between the random accesspreamble format and the timing advance configuration unit information isshown in Table 6. At other subcarrier spacings SCS=m*15 (kHz), wherein mis a positive integer, the timing advance configuration unit informationcorresponding to a certain random access preamble format is the timingadvance configuration unit information corresponding to the certainrandom access preamble format at reference subcarrier spacing of 15 kHzdivided by m. For example, if the timing advance configuration unitinformation corresponding to a random access preamble format K at areference subcarrier spacing is K0, the timing advance configurationunit information corresponding to the random access preamble format K atthe subcarrier spacing which is m multiple of the reference subcarrierspacing is: K0/m or L └K0/m┘ or ┌K0/m┐, where symbol └·┘ means floor,and symbol ┌·┐ means ceiling.

Besides, a relation may be directly established between the subcarrierspacing for the random access preamble and the timing advanceconfiguration unit information, regardless of the influence on the cellradius by the specific random access preamble format. One simple exampleis that, as shown in Table 8, a relation is established between thesubcarrier spacing for the random access preamble and the timing advanceconfiguration unit information, and the timing advance configurationunit information is obtained from the subcarrier spacing for the randomaccess preamble, wherein Ts=1/(64*30.72*106).

TABLE 8 Relation between the random access preamble formats and thetiming advance configuration unit information Subcarrier spacing Timingadvance for the random configuration unit Supported access preambleinformation cell radius (kHz) (Ts) (km) 15 1*32  5 30 1*64 10 60 2*64 20. . . . . .

It is to be noted that, in the practical notification and configurationways, the supported cell radius may not be configured, preset andnotified, and instead, only the random access preamble format, thesubcarrier spacing and the timing advance configuration unit informationare notified, preset and configured.

With this configuration way, the action of determining timing advancefor Msg3 on the terminal side can be simply described as follows:

A terminal reads random access configuration information, including therandom access preamble format, random access channel configuration,random access preamble resource pool information, and subcarrier spacingfor the random access channel (it is to be noted that the subcarrierspacing for the random access channel may be considered as thesubcarrier spacing for the random access preamble described above).

The terminal determines a random access channel and a random accesspreamble according to the random access configuration information andthe preset rule, and transmits the random access preamble on the randomaccess channel.

The terminal starts the detection of a random access response after afixed timing sequence, after completing the transmission of the randomaccess preamble. If a random access response is detected successfully,the TA configuration information and the uplink authorizationinformation in the random access response are read.

The terminal determines the TA interval configuration informationaccording to the random access preamble format and/or subcarrier spacingby the predetermined rule, and determines the specific TA informationaccording to the TA configuration information.

The terminal transmits the Msg3 according to the TA information and theuplink authorization information.

In this way, the base station implicitly informs the terminal of thespecific configuration way, by establishing a relation between therandom access preamble and/or subcarrier spacing for the random accesspreamble and the TA interval configuration information. In anotherconfiguration way, the base station directly informs the terminal of theTA interval configuration information by an index table. One possibleway is to establish an index table as shown in Table 9.

TABLE 9 Index table for timing advance configuration unit informationTiming advance configuration unit information Index (Ts) 0 K0 1 K1 2 K2. . . . . .

The base station carries, in the configuration information of RMSI orOSI, an index for the timing advance configuration unit information.Upon receiving the RMSI or OSI, the terminal determines the timingadvance configuration unit information according to the indexinformation.

At last, it is to be noted that, in this embodiment, it may be assumedthat the number of bits of TA configuration information in the randomaccess response will not change with the change in the random accesspreamble format or subcarrier spacing for the random access preamble.

In this embodiment, the received TA configuration information in therandom access response is N_(TA), and the TA configuration unitinformation determined according to the random access preamble formatand/or subcarrier spacing for the random access preamble is K, then thetiming advance for uplink data transmission is N_(TA)K seconds. It is tobe noted that K has contained sampling intervals Ts.

Embodiment Fifteen

In Embodiment fifteen, a method for acquiring configuration of timingadvance will be described in combination with a specific system. Thesystem supports several random access preamble formats, and differentrandom access preamble formats supports different cell radiuses. Therandom access preamble formats and other configuration informationnecessary for the random access process are transmitted in RMSI or OSI.In Embodiment fourteen, a way of adjusting the TA by changing the TAconfiguration unit information (i.e., TA configuration granularityinformation) without changing the TA configuration bit length has beenprovided. In this embodiment, a way of adjusting the TA configurationbit length information will be described.

One possible way of determining timing advance configuration bit lengthinformation is to establish, by means of predetermining, a relationbetween the random access preamble format and/or subcarrier spacing andthe timing advance configuration bit length information. Configurationis performed by an index table. That is, the terminal can determine thecorresponding timing advance configuration bit length informationaccording to the configured random access preamble format and/orsubcarrier spacing.

Table 10 shows a simple example where a relation is established betweenthe subcarrier spacing for the random access preamble and the TAconfiguration bit length information.

TABLE 10 The number of bits of timing advance configuration Subcarrierspacing for the random Timing advance access preamble configuration bit(kHz) length information 15 11 30 10 60  9 . . . . . .

Upon successfully detecting and receiving a random access response, theterminal determines the bit length information of the TA configurationinformation N_(TA) in the random access response according to the randomaccess preamble format and/or subcarrier spacing, and obtains thespecific TA configuration information.

In other processing ways, the terminal is explicitly informed of the TAconfiguration bit length information by an index table. For example, anindex table for the TA configuration information is established, and anindex for the TA configuration bit length information is transmitted inthe RMSI or OSI. The terminal determines the TA configuration bit lengthinformation according to the bit length index in the received RMSI orOSI.

In addition, the TA configuration bit length information correspondingto different preamble formats at a reference subcarrier spacing may bedefined. At other subcarrier spacings, the TA configuration bit lengthinformation corresponding to a corresponding preamble format iscorrespondingly adjusted. For example, the subcarrier spacing of 15 kHzfor a preamble is defined as the reference subcarrier spacing, and theTA configuration bit length information corresponding to a preambleformat is defined. For a subcarrier spacing of 15*m kHz for a preamble,wherein m is a positive integer, if the TA configuration bit lengthinformation corresponding to a preamble format A at the referencesubcarrier spacing is n, then the TA configuration bit lengthinformation corresponding to a same preamble format at the subcarrierspacing of 15*m kHz is n-m.

It is to be noted that, in the way as described in this embodiment, theTA configuration unit information (i.e., TA configuration granularityinformation) can be fixed, or configured and notified in the way asdescribed in Embodiment fourteen.

In this embodiment, the received TA configuration information in therandom access response is N_(TA), and the TA configuration unitinformation determined according to the random access preamble formatand/or subcarrier spacing for the random access preamble is K, then thetiming advance for uplink data transmission is N_(TA)K seconds. It is tobe noted that K has contained sampling intervals Ts.

Embodiment Sixteen

In Embodiment sixteen, a method for acquiring configuration of timingadvance will be described in combination with a specific system. In theabove two embodiments, the used method is to determine timing advanceaccording to the random access preamble and the random access channelconfiguration parameter. In this embodiment, a way of determining timingadvance adjustment amount information according to the subcarrierspacing for an allocated uplink channel will be described.

In this embodiment, the timing advance configuration information hasbeen determined in the way as described in Embodiment fourteen orfifteen, and the terminal has completed the random access process andstarts to perform data communication with the base station. During thedata communication process, due to the movement of the terminal or thechange of the wireless communication environment, the terminal willadjust the TA according to a TA adjustment command from the basestation. Since the used subcarrier spacing is different, the TAadjustment amount configuration granularity information is different.

By establishing a relation between the subcarrier spacing for uplinkdata transmission and the TA adjustment amount configuration granularityinformation (i.e., TA adjustment amount interval configurationinformation), the change in the TA adjustment amount configurationgranularity information, which is caused by the change in the subcarrierspacing, is adjusted.

Specifically, an index table shown in Table 11 can be used to establisha relation between the subcarrier spacing for uplink data transmissionand the TA adjustment amount configuration granularity information,wherein Ts=1/(64*30.72*106).

TABLE 11 TA adjustment amount configuration granularity information TAadjustment Subcarrier amount spacing for configuration uplink datagranularity transmission information (kHz) (Ts) 15 K0 30 K1 60 K2 . . .. . .

In this table, K0, K1 and K2 in the TA adjustment amount configurationgranularity information means that the TA adjustment amountconfiguration granularity information is K0*Ts, K1*Ts, K2*Ts at thissubcarrier spacing.

In this way provided in this embodiment, the terminal calculates newtiming advance N_(TA_new) according to the old timing advance N_(TA_old)and the TA adjustment amount information, specifically:

The terminal reads a TA adjustment amount command transmitted by thebase station through a high-layer signaling or downlink control channel,and determines the TA adjustment amount information according to therelation between the subcarrier spacing for uplink data transmission andthe TA adjustment amount configuration granularity information. If theTA adjustment amount command is N_(TA_off) and the TA adjustment amountconfiguration granularity information corresponding to the subcarrierspacing for uplink data transmission scheduled by the base station is K,the TA adjustment mount is N_(TA_adjust)=N_(TA_off)*K.

The terminal calculates new TA according to the existed TA and the TAadjustment amount information:

N _(TA_new) =N _(TA_old) +N _(TA_adjust)

It is to be noted that, according to the above description, both theN_(TA_old) and the N_(TA_adjust) have contained sampling intervals Ts.That is, they are an integral multiple of sampling intervals Ts.

Embodiment Seventeen

In Embodiment seventeen, a method for acquiring configuration of timingadvance will be described in combination with a specific system. In thisembodiment, contention-free random access will be taken intoconsideration.

The contention-free transmission can be used for cell handover or aprocess in which connection to a primary cell base station has beenestablished and connection to a small cell base station is to be furtherestablished. Since different cells use different bands, subcarrierspacings and supported cell radiuses, in different cells, the TAconfiguration granularity information and the desired range aredifferent.

The terminal is informed of the configuration information for thecontention-free random access process by a high-layer signaling (forexample, a cell handover process) or a downlink control channel (forexample, PDCCH command). The terminal determines the TA configurationgranularity information according to the random access preamble formatand/or the subcarrier spacing for the random access preamble in thereceived contention-free random access configuration information, anddetermines a TA command for subsequent data transmission according tothe TA configuration information in the random access response. Wherein,the determination of the TA configuration granularity informationaccording to the random access preamble format and/or the subcarrierspacing for the random access preamble in the received contention-freerandom access configuration information can be done by the methoddescribed in Embodiment fourteen and/or Embodiment fifteen.

The way provided in this embodiment can be used for cell handover, orconfiguration and notification of TA groups of multiple carriers duringthe carrier aggregation.

Embodiment Eighteen

In Embodiment eighteen, a method for acquiring timing advance adjustmentamount will be described in the context of a specific system.

As described in Embodiment sixteen, the TA adjustment amount granularityis determined by the subcarrier spacing for the uplink data transmissionchannel. The base station determines the TA adjustment amountgranularity information according to the subcarrier spacing for thecurrent uplink shared channel scheduled to the terminal, and transmitsthe TA adjustment amount configuration information. Upon receiving theTA adjustment amount configuration information, the terminal calculatesand adjusts the TA by using the TA adjustment amount configurationinformation after a fixed time period (for example, after k time slots),and transmits the uplink data according to the adjusted TA.

Since the terminal is allowed to use several possible subcarrierspacings in the 5G communication system, if the base station schedules,after it configures a TA adjustment amount and before the adjustmentamount goes into effect, an uplink shared channel with anothersubcarrier spacing for the uplink data transmission of the terminal,then the terminal will use the subcarrier spacing for the newlyscheduled uplink shared channel when using the TA adjustment amount. Asa result, errors occur in the calculation of TA.

To solve this problem, this embodiment provides following possible ways.

Method 1: The base station still determines the TA adjustment amountaccording to the subcarrier spacing for the current uplink sharedchannel scheduled to the terminal, and transmits it to the terminal by adownlink control channel or a high-layer signaling.

Upon receiving the TA adjustment amount information configured by thebase station, the terminal obtains the TA adjustment amount granularityinformation according to the subcarrier spacing for the current uplinkshared channel and calculates the TA adjustment amount. After a fixedtime period (for example, after k time slots), the TA is adjusted byusing the calculated TA adjustment amount, and the uplink data istransmitted according to the adjusted TA.

Method 2: The base station still determines the TA adjustment amountconfiguration information according to the subcarrier spacing for thecurrent uplink shared channel scheduled to the terminal, and transmitsit to the terminal by a downlink control channel or a high-layersignaling. The base station adds the TA adjustment amount granularityconfiguration information into a scheduling command when scheduling anuplink shared channel with another subcarrier spacing for the terminal.

Upon receiving the TA adjustment amount configuration information, theterminal determines the TA adjustment amount by using the configurationinformation after a fixed time period (for example, after k time slots).The terminal uses, by default, the TA adjustment amount granularitycorresponding to the subcarrier spacing for the uplink shared channelafter the fixed time period to calculate the TA adjustment amount. Ifthe terminal receives the scheduling information from the base stationwithin the fixed time period and the scheduling information contains theTA adjustment amount granularity information, the terminal calculatesthe TA adjustment amount according to the TA adjustment amountgranularity information in the scheduling information.

In this method, if the scheduling information from the base station hasbeen transmitted to the terminal before the transmitting of the TAadjustment amount configuration information, the terminal determines thegranularity of the TA adjustment amount according to the currentsubcarrier spacing (or determines the granularity according to thegranularity information in the previous scheduling information); and ifthe scheduling information from the base station is transmitted to theterminal after the transmitting of the TA adjustment amountconfiguration information, the terminal calculates the TA adjustmentamount according to the granularity information in the schedulinginformation and the TA configuration information.

Wherein, the TA adjustment granularity information carried in thescheduling information from the base station may be configured andnotified by an index. For example, one possible granularity informationindex table is shown in Table 12.

TABLE 12 TA adjustment amount configuration granularity information TAadjustment amount configuration granularity information Index (Ts) 0 K01 K1 2 K2 . . . . . .

Wherein, in Table 12, Ts=1/(64*30.72*106).

An index corresponding to TA adjustment amount configuration granularityinformation is transmitted in the scheduling information from the basestation.

Method 3: The base station still determines the TA adjustment amountconfiguration information according to the subcarrier spacing for thecurrent uplink shared channel scheduled to the terminal, and transmitsit to the terminal by a downlink control channel or a high-layersignaling. The base station adds the TA adjustment amount configurationinformation corresponding to this subcarrier spacing into a schedulingcommand when scheduling an uplink shared channel with another subcarrierspacing for the terminal.

Upon receiving the TA adjustment amount configuration information, theterminal determines the TA adjustment amount by using the configurationinformation after a fixed time period (for example, after k time slots).The terminal uses, by default, the TA adjustment amount granularitycorresponding to the subcarrier spacing for the uplink shared channelafter the fixed time period to calculate the TA adjustment amount. Ifthe terminal receives the scheduling information from the base stationwithin the fixed time period and the scheduling information contains newTA adjustment amount configuration information, the terminal determinesthe TA adjustment amount granularity according to the newly configuredsubcarrier spacing, determines the TA adjustment amount according to theTA adjustment amount configuration information in the schedulinginformation, and adjusts the TA to complete the transmitting of theuplink data.

Based on the method for acquiring configuration of TA according to thepresent invention, the present invention further provides a device foracquiring configuration of TA, applied on the terminal side. As shown inFIG. 46 , the device comprises:

-   -   a first processing unit 51 configured to acquire random access        configuration information and transmit a random access preamble        according to the random access configuration information;    -   a second processing unit 52 configured to detect a random access        response and acquire first timing advance configuration        information carried in the random access response; and    -   a third processing unit 53 configured to determine second timing        advance configuration information according to the random access        configuration information and/or the first timing advance        configuration information, and determine a timing advance        according to the second timing advance configuration        information.

Random access preamble configuration information is carried in therandom access configuration information. The third processing unit 53 isconfigured to determine timing advance interval configurationinformation according to the random access preamble configurationinformation; and determine second timing advance configurationinformation according to the timing advance interval configurationinformation and/or the first timing advance configuration information.

Timing advance interval configuration information is determinedaccording to the random access preamble configuration information,wherein the random access preamble configuration information and thetiming advance interval configuration information satisfy apredetermined mapping rule.

The third processing unit 53 is configured to preconfigure a mappingrule between reference random access preamble configuration informationand timing advance interval configuration information, and determine thetiming advance interval configuration information according to aproportional relation between the random access preamble configurationinformation and the reference random access preamble configurationinformation and the mapping rule; and the random access preambleconfiguration information is random access preamble subcarrier spacinginformation.

Random access preamble configuration information is carried in therandom access configuration information. The third processing unit 53 isconfigured to determine timing advance configuration bit lengthinformation according to the random access preamble configurationinformation; and determine second timing advance configurationinformation according to the timing advance configuration bit lengthinformation and/or the first timing advance configuration information.

Timing advance configuration bit length information is determinedaccording to the random access preamble configuration information,wherein the random access preamble configuration information and thetiming advance configuration bit length information satisfy apredetermined mapping rule.

The random access preamble configuration information is specificallyrandom access preamble format information and/or random access preamblesubcarrier spacing information.

First index information is carried in the random access configurationinformation. The third processing unit 53 is configured to acquire,according to the first index information, timing advance intervalconfiguration information corresponding to the first index information;and determine second timing advance configuration information accordingto the timing advance interval configuration information and/or thefirst timing advance configuration information.

Second index information is carried in the random access configurationinformation. The third processing unit 53 is configured to acquire,according to the second index information, timing advance configurationbit length information corresponding to the second index information;and determine second timing advance configuration information accordingto the timing advance configuration bit length information and/or thefirst timing advance configuration information.

The third processing unit 53 is further configured to determine timingadvance according to the first timing advance configuration information,the determined timing advance configuration bit length information, andthe timing advance interval configuration information determinedaccording to the random access configuration information.

The third processing unit 53 is further configured to:

-   -   receive timing advance adjustment indication information        transmitted by a base station;    -   determine timing advance adjustment amount configuration        information according to the timing advance adjustment        indication information and preconfigured uplink data        transmission subcarrier spacing information; and    -   determine timing advance adjustment amount information according        to the uplink data transmission subcarrier spacing information        and the determined timing advance adjustment amount        configuration information;    -   wherein the preconfigured uplink data transmission subcarrier        spacing information is specifically uplink data transmission        subcarrier spacing information preconfigured by a terminal or        received uplink data transmission subcarrier spacing information        which is preconfigured and then transmitted by a base station.

The third processing unit 53 is further configured to inquire a thirdassociative mapping list according to the uplink data transmissionsubcarrier spacing information to acquire timing advance adjustmentamount interval information corresponding to the uplink datatransmission subcarrier spacing information in the third associativemapping list; and determine timing advance adjustment amount informationaccording to the timing advance adjustment amount interval informationand the timing advance adjustment amount configuration information.

The third processing unit 53 is further configured to determine theadjusted timing advance according to the timing advance adjustmentamount information and the determined timing advance.

Wherein, the processing in the random access process is specificallyprocessing in the contention-free random access process.

The third processing unit 53 is further configured to transmit Msg3according to uplink authorization information carried in the randomaccess response and the determined timing advance.

Based on the method for configuring TA according to the presentinvention, the present invention further provides a device forconfiguring TA, applied on the base station side. As shown in FIG. 47 ,the device comprises:

-   -   a transmitting unit 61 configured to transmit random access        configuration information to a terminal;    -   a receiving unit 62 configured to receive a random access        preamble transmitted by the terminal according to the random        access configuration information; and    -   a processing unit 63 configured to perform random access        according to the random access preamble, and transmit a random        access response carrying first timing advance configuration        information so that the terminal determines a timing advance        according to the first timing advance configuration information        and/or the random access configuration information.

Wherein, first index information is carried in the random accessconfiguration information so that the terminal acquires correspondingtiming advance interval configuration information according to the firstindex information.

Second index information is carried in the random access configurationinformation so that the terminal acquires corresponding timing advanceconfiguration bit length information according to the second indexinformation.

The present invention further provides a terminal apparatus comprising amemory and a first processor, wherein the memory is configured to storecomputer programs that, when executed by the first processor, implementsteps of a method for acquiring configuration of a timing advance asdescribed above.

The present invention further provides a base station comprising amemory and a second processor, wherein the memory is configured to storecomputer programs that, when executed by the second processor, implementsteps of a method for acquiring configuration of a timing advance asdescribed above.

It should be understood by those skilled in the art that computerprogram instructions can be used to realize each block in structurediagrams and/or block diagrams and/or flowcharts as well as acombination of blocks in the structure diagrams and/or block diagramsand/or flowcharts. It should be understood by those skilled in the artthat these computer program instructions can be provided to generalpurpose computers, special purpose computers or other processors ofprogrammable data processing means to be implemented, so that solutionsdesignated in a block or blocks of the structure diagrams and/or blockdiagrams and/or flow diagrams are executed by computers or otherprocessors of programmable data processing means.

The modules in the devices of the present invention can be integratedtogether, or can be deployed separately. The modules can be integratedinto one module, or can be further split into multiple submodules.

It should be understood by those skilled in the art that the drawingsare merely schematic diagrams of one preferred embodiment, and themodules or flows in the drawings are not necessary for theimplementation of the present invention.

It should be understood by those skilled in the art that the modules inthe devices in the embodiments can be distributed in the devices in theembodiments according to the descriptions in the embodiments, or can belocated in one or more devices in the embodiments in accordance withcorresponding changes. The modules in the embodiments can be integratedinto one module, or can be further split into multiple submodules.

The serial number in the present invention is merely for description anddoes not represent the superiority of the embodiments.

The foregoing description merely shows several specific embodiments ofthe present invention, and the present invention is not limited thereto.Any variation conceived by those skilled in the art shall fall into theprotection scope of the present invention.

As those skilled in the art can understand, the program running on thedevice according to the present disclosure may be a program that causesa computer to realize the functions of the embodiments of the presentdisclosure by controlling a central processing unit (CPU). The programor the information processed by the program may be temporarily stored ina volatile memory such as a random access memory (RAM), a hard diskdrive (HDD), a non-volatile memory such as a flash memory, or othermemory system.

A program for implementing the functions of the embodiments of thepresent disclosure may be recorded on a computer-readable recordingmedium. The corresponding functions can be realized by causing acomputer system to read the program recorded on the recording medium andexecute the program. The so-called “computer system” herein may be acomputer system embedded in the device, and may include an operatingsystem or hardware such as a peripheral device. The “computer-readablerecording medium” may be a semiconductor recording medium, an opticalrecording medium, a magnetic recording medium, a recording medium thatdynamically stores programs in short time, or any other recording mediumreadable by a computer.

Various features or functional modules of the device used in the aboveembodiments may be implemented or executed by a circuit (for example,monolithic or multi-chip integrated circuits). Circuits designed toperform the functions described in this specification may includegeneral purpose processors, digital signal processors (DSPs),application specific integrated circuits (ASICs), field programmablegate arrays (FPGAs), or other programmable logic devices, discrete Gateor transistor logic, discrete hardware components, or any combination ofthe above. The general purpose processor may be a microprocessor or anyexisting processor, controller, microcontroller, or state machine. Theabove circuit can be a digital circuit or an analog circuit. One or moreembodiments of the present disclosure may also be implemented using newintegrated circuit technologies in the case of the new integratedcircuit technology that has replaced the existing integrated circuitsdue to advances in semiconductor technology.

As above, the embodiments of the present disclosure have been describedin detail with reference to the drawings. However, the specificconfiguration is not limited to the above embodiments, and the presentdisclosure also includes any design changes without departing from thegist of the present disclosure. In addition, various modifications maybe made to the present disclosure within the scope of the appendedclaims, and the embodiments obtained by appropriately combining thetechnical means disclosed in the different embodiments are also includedin the technical scope of the present disclosure. In addition, thecomponents having the same effects described in the above embodimentsmay be replaced with each other.

The above description is only the preferred embodiments of the presentapplication and the explanation of the technical principles used. Itshould be understood by those skilled in the art that the scope of theinvention involved in the present application is not limited to thetechnical solutions formed by a specific combination of the abovetechnical features and should also cover other technical solutionsformed by any combination of the above technical features or theirequivalent features without departing from the inventive concept, forexample, the technical solutions formed by replacing the above featureswith the technical features having similar functions disclosed in thepresent application (but not limited to thereto).

What is claimed is:
 1. A method by a user equipment (UE) in a wireless communication system, the method comprising: measuring a signal of a target cell; transmitting, to a network node, a measurement report on the signal of the target cell; receiving, from the network node, a handover command including resource configuration information comprising random access resource configuration information indicating that a random access is to be performed on one of a normal uplink or a supplementary uplink; and performing the random access to the target cell based on the resource configuration information.
 2. The method according to claim 1, wherein the resource configuration information includes an indication indicating to the UE whether to use the normal uplink or the supplementary uplink for the random access.
 3. A method by a network node in a wireless communication system, the method comprising: receiving, from a user equipment (UE), a measurement report on a signal of a target cell; and transmitting, to the UE, a handover command including resource configuration information comprising random access resource configuration information indicating that a random access is to be performed on one of a normal uplink or a supplementary uplink based on the measurement report.
 4. The method according to claim 3, wherein the resource configuration information includes an indication indicating to the UE whether to use the normal uplink or the supplementary uplink for the random access.
 5. A user equipment, comprising: a communication interface configured to communicate; a processor; and a memory storing computer-executable instructions that, when executed by the processor, cause the processor to perform the following operations: measuring a signal of a target cell; transmitting, to a network node, a measurement report on the signal of the target cell; receiving, from the network node, a handover command including resource configuration information comprising random access resource configuration information indicating that a random access is to be performed on one of a normal uplink or a supplementary uplink; and performing the random access to the target cell based on the resource configuration information.
 6. The user equipment according to claim 5, wherein the resource configuration information includes an indication indicating to the user equipment whether to use the normal uplink or the supplementary uplink for the random access.
 7. A network node, comprising: a communication interface configured to communicate; a processor; and a memory storing computer-executable instructions that, when executed by the processor, cause the processor to perform the following operations: receiving, from a user equipment (UE), a measurement report on a signal of a target cell; and transmitting, to the UE, a handover command including resource configuration information comprising random access resource configuration information indicating that a random access is to be performed on one of a normal uplink or a supplementary uplink based on the measurement report.
 8. The network node according to claim 7, wherein the resource configuration information includes an indication indicating to the UE whether to use the normal uplink or the supplementary uplink for the random access. 